Trimethylene Dithioacetals of Carbohydrates, Part 6: C-C Coupling Reactions of Dilithiated <i>N</i>-Acetyl-<scp>d</scp>-glucosamine Trimethylene Dithioacetal Derivatives
dithioacetal (2) underwent fast β-elimination, the corresponding N-acetyl derivative 3 was easily deprotonated with butyllithium to form the dilithiated intermediate 7, which was stabilized by the α-lithium imidate and reacted well with various electrophilic reagents to yield the chain-elongated products 11a-c and 12a,b. The reaction between the intermediate 7 and an unreactive 3-ulose 13 indicates that
d-Glucosamine propanedithioacetal, an efficient chiral auxiliary in β-Lactam chemistry1Dedicated to Professor Sir Derek H. R. Barton.1
作者:Josefa Anaya、Stephane D Gero、Manuel Grande、José Ignacio M Hernando、Nieves M Laso
DOI:10.1016/s0968-0896(98)00264-8
日期:1999.5
The synthesis of some monocyclic beta-lactams (monobactams) by the Staudinger reaction using D-glucosamine propanedithioacetal as chiral auxiliary is reported. The influence of several radicals at C-3, C-4, and C-1' (sugar moiety) as well as other structural aspects are considered in relation to the antielastase activity. (C) 1999 Elsevier Science Ltd. All rights reserved.
BARTON, DEREK H. R.;GATEAU-OLESKER, ALICE;ANAYA-MATEOS, JOSEFA;CLEOPHAX, +, J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N1, C. 3211-3212
作者:BARTON, DEREK H. R.、GATEAU-OLESKER, ALICE、ANAYA-MATEOS, JOSEFA、CLEOPHAX, +