Intramolecular Aldol Ring Closures of Cysteine Derivatives Leading to Densely Functionalised Pyroglutamates
作者:Hadia Almahli、Niamh C. Jimenez、Mark G. Moloney
DOI:10.1055/s-0037-1611829
日期:2019.6
The synthesis of densely functionalised pyroglutamates derived from cysteine by an aldol cyclisation strategy has been achieved.
已经实现了通过羟醛环化策略合成源自半胱氨酸的密集功能化焦谷氨酸盐。
Asymmetric synthesis of 2-alkyl-3-thiazoline carboxylates: stereochemistry of the MnO2-mediated oxidation of cis- and trans-2-alkyl-thiazolidine-(4R)-carboxylates
作者:Xavier Fernandez、Elisabet Duñach
DOI:10.1016/s0957-4166(01)00219-1
日期:2001.6
The asymmetric synthesis of a series of 3-thiazoline carboxylates, 2, was effected by MnO2 oxidation of the corresponding cis/trans thiazolidines, 1. The stereochemistry of the oxidation reaction was studied using NMR and chiral GC analyses. Compounds 2 were obtained with enantiomeric excesses (e.e.s) in the range of 40–100%.
The reduction of aromatic ketones by borane in the presence of the inseparable diastereoisomeric mixture of 2-substituted thiazolidine-4-methanol has been investigated. Modest to high enantiomeric excesses were obtained increasing with thiazolidine steric hindrance. (C) 1997 Elsevier Science Ltd.
Bicyclic Lactams Derived from Serine or Cysteine and 2-Methylpropanal
作者:Mark G. Moloney、Halima Bagum、Bethany R. Shire、Kirsten E. Christensen、Miroslav Genov、Alexander Pretsch、Dagmar Pretsch
DOI:10.1055/s-0039-1691569
日期:2020.3
Bicyclic lactams may be prepared from serine or cysteine and 2-methylpropanal; the resulting S,N-heterocycles are more stable than the corresponding O,N-heterocycles but both are synthetic intermediates capable of further elaboration.