Simple and mild esterification of N-protected amino acids with nearly equimolar amounts of alcohols using 1-tert-butoxy-2-tert-butoxycarbonyl-1,2-dihydroisoquinoline
A very mild, one-step esterification using nearly equimolar amounts of N-protectedaminoacids and alcohols, in conjunction with 1-tert-butoxy-2-tert-butoxycarbonyl-1,2-dihydroisoquinoline (BBDI) as a novel condensing reagent is described.
A novel 1-tert-butoxy-2-tert-butoxycarbonyl-1,2-dihydroisoquinoline (BBDI)-catalyzed esterification of N-protected amino acids with nearly equimolar amounts of alcohols in the presence of Boc2O
作者:Yukako Saito、Tomokazu Watanabe、Hiroki Takahata
DOI:10.1016/j.tetlet.2006.02.149
日期:2006.5
A very mild, BBDI-catalyzed esterification using approximately equimolar amounts of N-protectedaminoacids and alcohols, in junction with Boc2O is described.
描述了使用约等摩尔量的N-保护的氨基酸和醇与Boc 2 O连接的非常温和的BBDI催化的酯化反应。
Chromatographic arylcarboxamide polysiloxanes
申请人:Brigham Young University
公开号:US04909935A1
公开(公告)日:1990-03-20
Chiral arylcarboxamide-containing alkenes and alkoxysilanes and polysiloxane polymers containing chiral arylcarboxamide-substituted side chains and methods for their preparation are disclosed. The chiral arylcarboxamide-containing alkenes are used to prepare the chiral arylcarboxamide-containing polysiloxane polymers which are useful as stationary phase coatings in gas-liquid and supercritical fluid chromatography in the separation and analysis of enantiomeric and other stereoisomeric mixtures of various substances. The chiral arylcarboxamide containing alkoxysilanes are reactive towards silica particles for use as packing in liquid chromatography columns.
two-step intermolecular esterification via the condensation of carboxylic acids with nucleophilic hydroxyl species was reported. A broad substrate scope with respect to carboxylic acids, alcohols, and phenols was observed. The α-acyloxyenamide intermediates formed by the addition of carboxylic acids to ynamides proved to be effective acylating reagents for the esterification of alcohol and phenol derivatives