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Paolo Boggio et al.
Organic & biomolecular chemistry, 13(11), 3288-3297 (2015-02-04)
In this study the hydroboration reaction has been exploited to produce in only four steps a new lipophilic GdBNCT/MRI agent (PB01). As a matter of fact, the formation of a new B–C bond to link the decaborane with the lipophilic
Shigeki Kawai et al.
Nature communications, 6, 8098-8098 (2015-08-26)
Boron is a unique element in terms of electron deficiency and Lewis acidity. Incorporation of boron atoms into an aromatic carbon framework offers a wide variety of functionality. However, the intrinsic instability of organoboron compounds against moisture and oxygen has
Carl Redshaw et al.
Dalton transactions (Cambridge, England : 2003), 42(6), 1983-1986 (2013-01-03)
The structures of three novel compounds prepared from the reaction of the lower-rim 1,3-diacid calix[4]arene (LH(2)) with lithium carbonate (1), t-butyl-lithium (2) and zinc acetate (3) are reported.
Hiroki Mandai et al.
Bioorganic & medicinal chemistry, 22(19), 5338-5344 (2014-08-26)
Interleukin (IL)-6 is a proinflammatory cytokine that performs a wide variety of biological functions, including important roles in the progression of chronic inflammatory diseases such as periodontal disease. (+)-Terrein, a secondary bioactive fungal metabolite isolated from Aspergillus terreus, has various
Hyojung Cha et al.
ACS applied materials & interfaces, 6(18), 15774-15782 (2014-08-26)
The molecular packing structures of two conjugated polymers based on alkoxy naphthalene, one with cyano-substituents and one without, have been investigated to determine the effects of electron-withdrawing cyano-groups on the performance of bulk-heterojunction solar cells. The substituted cyano-groups facilitate the
Shouli Ming et al.
ACS applied materials & interfaces, 7(21), 11089-11098 (2015-05-09)
Thiadiazolo[3,4-c]pyridine (PT), an important analog of benzothiadiazole (BT), has most recently been explored as a novel electron acceptor. It exhibits more electron-accepting ability and other unique properties and potential advantages over BT, thus inspiring us to investigate PT-based donor-acceptor-type (D-A)
Total synthesis of the antibiotic branimycin.
Stefan Marchart et al.
Angewandte Chemie (International ed. in English), 49(11), 2050-2053 (2010-02-11)
Bernhard J Ueberbacher et al.
Chemical communications (Cambridge, England), (28)(28), 3287-3289 (2008-07-16)
An ortho-metalation method for free ferrocenyl alcohols has been developed, which allows preparation of planar chiral ferrocene derivatives with high yields and diastereoselectivities.
Debabrata Jana et al.
Organic & biomolecular chemistry, 13(43), 10663-10674 (2015-09-09)
Four pyrene-vinyl-tetraphenylethylene based conjugated materials were synthesized and characterized by FT-IR, NMR, and mass spectroscopy. The photophysical (including absorption, fluorescence, and fluorescence lifetime) and aggregation properties in tetrahydrofuran were investigated. The photophysical and aggregation behavior depends on the spacer, substituent
Chee Shan Lim et al.
Nanoscale, 7(29), 12527-12534 (2015-07-04)
Layered transition metal diborides (TMDB), amongst other refractory metal borides, are commonly employed for material fabrication such as wear- and corrosion-resistant coatings due to their impressive chemical stability and thermal conductivity. In spite of the wide scope of studies carried
Petra Rönnholm et al.
Organic letters, 9(19), 3781-3783 (2007-08-19)
A robust and scaleable route to chiral 1-isopropylamino-2-(diphenylphosphino)ethanes is described via the ring-opening of chiral, cyclic sulfamidates with potassium diphenylphosphide (KPPh(2)). The novel protocol offers a robust access to gram quantities of chiral amino phosphinoethanes in high yields. The Li-amides
Yuqiang Ma et al.
ACS nano, 9(7), 7383-7391 (2015-07-01)
Two-dimensional (2D) semiconducting monolayer transition metal dichalcogenides (TMDCs) have stimulated lots of interest because they are direct bandgap materials that have reasonably good mobility values. However, contact between most metals and semiconducting TMDCs like 2H phase WSe2 are highly resistive
André M Bienfait et al.
Dalton transactions (Cambridge, England : 2003), 43(46), 17324-17332 (2014-10-17)
Trivalent Eu[N(SiHMe2)2]3(THF)2 can easily be synthesized by applying a routine salt metathesis protocol (EuCl3(THF)2 and 3 equiv. of Li[N(SiHMe2)2] in n-hexane) which crystallizes isotypically to its analogues of the rare-earth metal series (space group P21/c). Transsilylamination of Eu[N(SiMe3)2]2(THF)2 with a
Torben Steenbock et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 16(7), 1491-1501 (2015-02-24)
Photoswitching is an intriguing way of incorporating functionality into molecules or their subunits. Dithienylethene switches are particularly promising, but have so far mostly been studied with five-membered ring (cyclopentenyl) backbones. We aim at comparing the switching properties of backbones with
Xudong Guo et al.
Analytica chimica acta, 869, 81-88 (2015-03-31)
A novel "turn-on" two-photon fluorescent probe containing a π-conjugated triarylboron luminogen and a maleimide moiety DMDP-M based on the photo-induced electron transfer (PET) mechanism for biothiol detection was designed and synthesized. By simply loading the hydrophobic DMDP-M on a cross-linked
Lawrence M Pratt et al.
The Journal of organic chemistry, 68(16), 6387-6391 (2003-08-05)
The effects of lithium dialkylamide structure, mixed aggregate formation, and solvation on the stereoselectivity of ketone enolization were examined. Of the lithium dialkylamides examined, lithium tetramethylpiperidide (LiTMP) in THF resulted in the best enolization selectivity. The stereoselectivity was further improved
Erik Selander et al.
Proceedings of the National Academy of Sciences of the United States of America, 112(20), 6395-6400 (2015-04-29)
Interactions among microscopic planktonic organisms underpin the functioning of open ocean ecosystems. With few exceptions, these organisms lack advanced eyes and thus rely largely on chemical sensing to perceive their surroundings. However, few of the signaling molecules involved in interactions
Michiko Sasaki et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 15(18), 4663-4666 (2009-03-21)
Don't get trapped: The effect of conjugating electron-withdrawing groups and alpha-anion-stabilizing heteroatom substituents on configurational stability of chiral carbanions through a double bond was examined on the basis of extent of chirality transfer in intramolecular trapping in [2,3]-Wittig rearrangement of
Karl J Hale et al.
Organic letters, 5(4), 503-505 (2003-02-14)
[reaction: see text] The "Southern Hemisphere" intermediate 2, used by Masamune and co-workers for their asymmetric total synthesis of bryostatin 7 (1), has been synthesized from (E)-1,4-hexadiene (11) by a 24-step pathway that has a longest linear sequence of only
Jennifer L Rutherford et al.
Journal of the American Chemical Society, 124(2), 264-271 (2002-01-10)
6Li and (13)C NMR spectroscopic studies were carried out on [(6)Li]n-BuLi and [(6)Li]PhLi (RLi) in toluene-d(8) containing the following diamines: N,N,N',N'-tetramethylethylenediamine (TMEDA), N,N,N',N'-tetraethylethylenediamine, 1,2-dipyrrolidinoethane, 1,2-dipiperidinoethane, N,N,N',N'-tetramethylpropanediamine, trans-(R,R)-N,N,N',N'-tetramethylcyclohexanediamine, and (-)-sparteine. Dimers of general structure (RLi)(2)S(2) (S = chelating diamine) are formed
Holger Braunschweig et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(31), 11056-11064 (2015-06-26)
Taking advantage of an improved synthesis of [Ti(η(6) -C6 H6 )2 ], we report here the first examples of ansa-bridged bis(benzene) titanium complexes. Deprotonation of [Ti(η(6) -C6 H6 )2 ] with nBuLi in the presence of N,N,N',N'',N''-pentamethyldiethylenetriamine (pmdta) leads to
Shigeo Hayashi et al.
Journal of enzyme inhibition and medicinal chemistry, 29(6), 846-867 (2014-02-13)
Because of the pivotal role of cyclooxygenase (COX) in the inflammatory processes, non-steroidal anti-inflammatory drugs (NSAIDs) that suppress COX activities have been used clinically for the treatment of inflammatory diseases/syndromes; however, traditional NSAIDs exhibit serious side-effects such as gastrointestinal damage
Deyu Li et al.
The Journal of organic chemistry, 73(6), 2373-2381 (2008-02-26)
A system consisting of a chiral lithium amide and n-BuLi in tol-d(8) solution was investigated with (1)H and (13)C INEPT DOSY, (6)Li and (15)N NMR, and other 2D NMR techniques. A mixed 2:1 trimeric complex was identified as the major
Przemysław J Boratyński et al.
The Journal of organic chemistry, 73(18), 7357-7360 (2008-08-09)
An unexpected stereoselective direct dimerization occurred when 9-quinine halide was treated with butyllithium. The reaction of either (9S)- or (9R)-chloroquinine gave the same C2-symmetric dimer with 9R configuration (X-ray structure). A tentative mechanism involving radical recombination is discussed. This highly
Mark A Forman et al.
The Journal of organic chemistry, 72(8), 2996-3005 (2007-03-16)
The highly pyramidalized alkene, pentacyclo[,4).0(3,8).0(5,7)]non-4-ene (9), has been generated via treatment of 4,5-diiodopentacyclo[,4).0(3,8).0(5,7)]nonane (12) with n-butyllithium and tert-butyllithium. The title alkene has also been trapped as its Diels-Alder adduct with 1,3-diphenylisobenzofuran, 2,5-dimethylfuran, and spiro[2.4]hepta-4,6-diene. Products resulting from alkyllithium addition to
Paul R Blakemore et al.
The Journal of organic chemistry, 72(24), 9368-9371 (2007-11-02)
Incubation of (+/-)-7,7'-di(pentanoyloxy)-8,8'-biquinolyl (4) with a crude cholesterol esterase preparation (from bovine pancreas) yielded highly enantioenriched unreacted dextrorotatory material, (+)-(aR)-4 (46%, > or = 99% ee), accompanied by the expected diol product, (-)-(aS)-7,7'-dihydroxy-8,8'-biquinolyl (1), in modest enantiomeric excess (> or
Enantioselective total synthesis of the marine toxin (-)-gymnodimine employing a Barbier-type macrocyclization.
Ke Kong et al.
Angewandte Chemie (International ed. in English), 48(40), 7402-7405 (2009-09-04)
Subramanian Devaraj et al.
Carbohydrate research, 344(10), 1159-1166 (2009-06-11)
O-Alkylation of myo-inositol derivatives containing more than one hydroxyl group via their alkali metal alkoxides (sodium or lithium) preferentially occurs at a hydroxyl group having a vicinal cis-oxygen atom. In general the observed selectivity is relatively higher for lithium alkoxides
Lin Zhu et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(12), 4721-4730 (2015-02-11)
2-Thienylpyridyl iridium(III) complexes containing an o-, m-, or p-carboranylvinyl-2,2'-bipyridine ligand and various counteranions (denoted o-PF6, m-BF4, m-PF6, m-SbF6, m-ClO4, m-OTf, m-NO3, m-BPh4, m-F, m-Cl, and p-PF6) were synthesized by using C-formyl carboranes as starting materials. The solid-state structures of o-PF6
Akram Ayoub et al.
International journal of biological macromolecules, 75, 13-20 (2015-01-21)
Our laboratory has developed a technique to reconstruct in vitro tissue from human cells using the self-assembly tissue-engineering method, which utilizes the ability of fibroblasts to deposit the matrix they secrete. The time necessary for tissue construction, several weeks, is
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