Qiu-Fen Hu et al.
Journal of natural products, 76(10), 1854-1859 (2013-09-26)
Eight new C-4-alkylated deoxybenzoins (1-8), three new diphenylethylenes (9-11), and five known diphenylethylenes were isolated from Arundina graminifolia. The structures of 1-11 were elucidated by spectroscopic methods including extensive 1D and 2D NMR techniques. Compounds 9-11 are the first naturally...
Javier Izquierdo et al.
Angewandte Chemie (International ed. in English), 51(47), 11686-11698 (2012-10-18)
N-Heterocyclic carbene (NHC) catalyzed transformations have emerged as powerful tactics for the construction of complex molecules. Since Stetter's report in 1975 of the total synthesis of cis-jasmon and dihydrojasmon by using carbene catalysis, the use of NHCs in total synthesis...
Structures and reactivities of O-methylated Breslow intermediates.
Biplab Maji et al.
Angewandte Chemie (International ed. in English), 51(41), 10408-10412 (2012-09-13)
Tsuneomi Kawasaki et al.
Angewandte Chemie (International ed. in English), 50(35), 8131-8133 (2011-07-16)
Trigger happy: chiral oxygen isotopomers of hydrobenzoin ([(18)O](R)-1 and [(18)O](S)-1) acted as chiral triggers to induce the enantioselective addition of iPr(2)Zn to pyrimidine-5-carbaldehyde. An extremely small chiral influence arising from the presence of the oxygen isotope ((18)O) is amplified through...
Umpolung by N-heterocyclic carbenes: generation and reactivity of the elusive 2,2-diamino enols (Breslow intermediates).
Albrecht Berkessel et al.
Angewandte Chemie (International ed. in English), 51(49), 12370-12374 (2012-10-20)