Synthesis of modified partial structures of the bacterial cell wall. 1. Lipopeptides containing nonproteinogenic amino acids
摘要:
Two stereoisomeric lipopeptides 1 and 2 which can be regarded as modified peptidoglycans have been synthesized by using three different reaction sequences. The ene reaction of the alpha-allylated dipeptide 12 with butyl glyoxylate was used as a key step. The required enantiomerically pure substrates 9, 10, and 23 were obtained by enzymatic hydrolysis of the corresponding racemic alpha-allylated esters. The absolute configuration of both stereoisomers 1 and 2 was assigned by oxidative cleavage of the double bond in 18 and 19 followed by comparison of the esterified degradation products 28 and 29 with samples of authentic configuration, derived from (R)- and (S)-malic acid.
Synthesis of modified partial structures of the bacterial cell wall. 1. Lipopeptides containing nonproteinogenic amino acids
摘要:
Two stereoisomeric lipopeptides 1 and 2 which can be regarded as modified peptidoglycans have been synthesized by using three different reaction sequences. The ene reaction of the alpha-allylated dipeptide 12 with butyl glyoxylate was used as a key step. The required enantiomerically pure substrates 9, 10, and 23 were obtained by enzymatic hydrolysis of the corresponding racemic alpha-allylated esters. The absolute configuration of both stereoisomers 1 and 2 was assigned by oxidative cleavage of the double bond in 18 and 19 followed by comparison of the esterified degradation products 28 and 29 with samples of authentic configuration, derived from (R)- and (S)-malic acid.
An expeditive and green chemo-enzymatic route to diester sinapoyl-<scp>l</scp>-malate analogues: sustainable bioinspired and biosourced UV filters and molecular heaters
作者:Benjamin Rioux、Louis M. M. Mouterde、Jimmy Alarcan、Temitope T. Abiola、Matthias J. A. Vink、Jack M. Woolley、Aurélien A. M. Peru、Matthieu M. Mention、Fanny Brunissen、Giel Berden、Jos Oomens、Albert Braeuning、Vasilios G. Stavros、Florent Allais
DOI:10.1039/d3sc04836e
日期:——
A highly regioselective lipase-catalyzed transesterification enabled the synthesis of sinapoyl malate diesters with fatty chains that proved to be exceptional UV filters and molecular heaters for plants.
Two stereoisomeric lipopeptides 1 and 2 which can be regarded as modified peptidoglycans have been synthesized by using three different reaction sequences. The ene reaction of the alpha-allylated dipeptide 12 with butyl glyoxylate was used as a key step. The required enantiomerically pure substrates 9, 10, and 23 were obtained by enzymatic hydrolysis of the corresponding racemic alpha-allylated esters. The absolute configuration of both stereoisomers 1 and 2 was assigned by oxidative cleavage of the double bond in 18 and 19 followed by comparison of the esterified degradation products 28 and 29 with samples of authentic configuration, derived from (R)- and (S)-malic acid.