electron-deficient azides or, preferably, 2,4-dinitrobenzenesulfonamides. In this manner the cyclic thioanhydride serves as a linchpin in a three-component coupling sequence. The use of thiomaleic anhydride and a bifunctional nucleophile extends the process to heterocycle synthesis, while a cyclic thioanhydride prepared from aspartic acid directly provides N-functionalized asparagine derivatives.
环状
硫代酸酐与胺的反应提供了被
硫代酸官能化的酰胺,其可以被缺电子的
叠氮化物或优选地2,4-
二硝基苯磺酰胺原位捕获。以这种方式,环状
硫代酸酐在三组分偶联序列中充当了关键。
硫代
马来酸酐和双官能亲核试剂的使用将工艺扩展到了杂环合成,而由
天冬氨酸制备的环状
硫代酸酐直接提供了N-官能化的天冬酰胺衍
生物。