2-(1,3-Dioxan-2-yl)ethylsulfonyl Group: A New Versatile Protecting and Activating Group for Amine Synthesis
作者:Izumi Sakamoto、Norimasa Izumi、Taeko Yamada、Tetsuto Tsunoda
DOI:10.1021/ol052545+
日期:2006.1.1
[reaction: see text] 2-(1,3-Dioxan-2-yl)ethylsulfonyl (Dios) chloride was synthesized and used as a new versatile sulfonating agent for amines. Primary and secondary amines were sulfonated very easily in excellent yields with Dios chloride. N-Nonsubstituted and N-monosubstituted Dios-amides, activated amines, were alkylated satisfactorily under new Mitsunobu conditions utilizing (cyanomethylene)tributylphosphorane
[反应:见正文]合成了2-(1,3-二氧杂-2-基)乙基磺酰氯(Dios)氯化物,并用作新型通用的胺类磺化剂。伯胺和仲胺很容易用氯化二硫磺以优异的产率磺化。在新的Mitsunobu条件下,利用(氰基亚甲基)三丁基磷烷(CMBP)将N-非取代和N-单取代的二氨基酰胺(活化胺)令人满意地烷基化。Dios基团在碱性和还原条件下非常稳定,可以通过在热的三氟乙酸水溶液中加热除去。