Preparation of Multiply Protected Alkylhydrazine Derivatives by Mitsunobu and PTC Approaches
作者:Nicolas Brosse、Maria-Fatima Pinto、Brigitte Jamart-Grégoire
DOI:10.1002/ejoc.200300445
日期:2003.12
Alkylation reactions of hydrazine derivatives by Mitsunobu or PTC approaches are described. It has been shown that aminophthalimide derivatives are better acidic partners than their aminoimidodicarbonate (NBoc2) analogues, the presence of the phthaloyl group increasing the acidity of the sole proton and concomitantly reducing steric hindrance. Moreover, N-aminophthalimide derivatives can be efficiently
描述了通过 Mitsunobu 或 PTC 方法对肼衍生物进行烷基化反应。已经表明,氨基邻苯二甲酰亚胺衍生物是比它们的氨基亚氨基二碳酸酯 (NBoc2) 类似物更好的酸性伙伴,邻苯二甲酰基的存在增加了唯一质子的酸度并同时减少了空间位阻。此外,N-氨基邻苯二甲酰亚胺衍生物可以在非常温和的条件下通过三阶段、一瓶程序有效地转化为相应的 N-氨基-亚胺二碳酸酯。这些程序也可以有效地用于制备正交 Nα,Nβ-diprotected α-肼酯。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)