Giuseppe Bartoli et al.
The Journal of organic chemistry, 71(26), 9580-9588 (2006-12-16)
The reaction between alcohols and Boc2O leads to the formation of tert-butyl ethers and/or Boc-alcohols, depending on the nature of the Lewis acid catalyst. Product distribution is mainly tuned by the anionic part of the salt. Perchlorates and triflates, anions...
Jason C Green et al.
Organic letters, 13(20), 5500-5503 (2011-09-21)
Total syntheses of two structures purported as (+)-heliananes were completed in six pots. Spectral comparisons, between the synthetic and natural compounds, revealed a misassignment of the eight-membered ring in the heliananes. The key step in the syntheses of the proposed...
Brandon S Fowler et al.
Journal of the American Chemical Society, 132(9), 2870-2871 (2010-02-18)
We report a fundamentally unique approach to the catalytic kinetic resolution of amine derivatives based on formamide and thioformamide substrates. Readily accessible histidine-containing peptides mediate the kinetic resolutions with as little as 5 mol % catalyst. Selectivity factors (k(rel)) as...
Asit K Chakraborti et al.
Organic & biomolecular chemistry, 4(14), 2769-2771 (2006-07-11)
Perchloric acid adsorbed on silica-gel (HClO4-SiO2) was found to be a new, highly efficient, inexpensive and reusable catalyst for chemoselective N-tert-butoxycarbonylation of amines at room temperature and under solvent-free conditions.
J S Allen et al.
Mutation research, 170(1-2), 23-29 (1986-04-01)
The Ames Salmonella/mammalian-microsome assay was used to evaluate the bacterial mutagenicity of 6 bioactive peptides and of 11 chemical reagents used in peptide synthesis. Samples of 2 reagents, bis(2-oxo-3-oxazolidinyl)phosphinic chloride and fluoren-9-ylmethyl chloroformate, showed mutagenic activity with strains TA100 and...