Lipase-catalyzed enantiomer selective hydrolysis of 1,2-diol diacetates
摘要:
Enantiomer selective hydrolysis of racemic 1,2-diol diacetates (rac-2a-h) was investigated by using the inexpensive commercial porcine pancreatic lipase. The hydrolysis proceeds with variable regioselectivity but with moderate to good enantioselectively yielding a mixture of isomeric monoacetates (3a-h and 4a-h) and unchanged diacetate enantiomers (2a-h). Evidence was found that both monoacetates (3a-h and 4a-h) are formed with the same sense of enantiomer selectivity.
Lipases from porcine pancreas (PPL) and Candida cylindracea (CCL) in different organicsolvents allow discrimination of the primary and secondary hydroxyl groups, and also between two primary hydroxyl groups towards acylation with 2,2,2-trifluoroethyl butyrate in diols and triols with high regioselectivity.
Metal‐Free Electrocatalytic Diacetoxylation of Alkenes
作者:Jef R. Vanhoof、Pieter J. De Smedt、Jan Derhaeg、Rob Ameloot、Dirk E. De Vos
DOI:10.1002/anie.202311539
日期:2023.12.4
A highly efficient electrocatalytic 1,2-dioxygenation of alkenes utilizing readily available materials in ambient conditions is developed. The protocol is widely applicable to aliphatic and aromatic alkenes with excellent faradaic efficiencies and yields of up to 96 %. The versatility of the method is expanded with alkenoic acids towards lactone derivatives and with other carboxylic acids like HCOOH