Improved synthesis of structural analogues of (−)-epicatechin gallate for modulation of staphylococcal β-lactam resistance
作者:James C. Anderson、Helen Grounds、Suzanna Reeves、Peter W. Taylor
DOI:10.1016/j.tet.2014.03.052
日期:2014.5
The high-yielding synthesis of enantiomerically pure epicatechin gallate analogues where the A and/or B-ring hydroxylation is reduced or altered has been achieved by optimising routes to the catechin stereochemistry. The B-ring analogues were synthesised by using an electrophilic ring closure onto an enantiomerically enriched epoxide as a key step. The A and B-ring hydroxyl-deleted analogues were synthesised through a Mitsunobu cyclisation. For the B-ring analogues, the anti- (catechin) stereochemistry was converted to the syn- (epicatechin) stereochemistry by a known oxidation/reduction protocol. Absolute stereochemistry was derived from either a Sharpless epoxidation or asymmetric dihydroxylation. (C) 2014 The Authors. Published by Elsevier Ltd. All rights reserved.
NAPOLITANO, ELIO;MORSANI, MASSIMO;FIASCHI, RITA, GAZZ. CHIM. ITAL., 121,(1991) N, C. 249-255