One-Pot Syntheses of Dissymmetric Diamides Based on the Chemistry of Cyclic Monothioanhydrides. Scope and Limitations and Application to the Synthesis of Glycodipeptides
作者:David Crich、Kaname Sasaki、Md Yeajur Rahaman、Albert A. Bowers
DOI:10.1021/jo900532e
日期:2009.5.15
protection of alcohols in the various reaction components. Reaction of N-benzyloxycarbonyl-l-aspartic monothioanhydride with unprotected glycosyl amines, followed by capture of the thioacid intermediate with N-sulfonyl amino acid derivatives results in a three-component convergent synthesis of glycosylated peptides.
胺打开环状一硫代酸酐可方便地进入酰胺基硫代酸,酰胺基硫代酸可被2,4-二硝基苯磺酰胺,电子缺陷性叠氮化物或在桑格氏试剂存在下被胺原位捕获,在每种情况下均导致不对称的二酰胺一锅三分量的耦合顺序 单硫代马来酸酐和双官能亲核试剂(如氨基硫醇)的使用提供了杂环酰胺的使用。环状一硫代酸酐对醇的低反应性使得能够使用甲醇作为溶剂,并且消除了在各种反应组分中保护醇的需要。的反应Ñ苄氧基羰基升-天冬氨酸单硫代酸酐与未保护的糖基胺,然后用N-磺酰基氨基酸衍生物捕获硫酸中间体,导致糖基化肽的三组分收敛合成。