Short and efficient route toward α-substituted N-arylazetidines from acetanilides via Mitsunobu reaction
作者:Nicolas Kern、Marie Hoffmann、Jean-Marc Weibel、Patrick Pale、Aurélien Blanc
DOI:10.1016/j.tet.2014.06.106
日期:2014.9
N-Arylazetidines are efficiently obtained in a three-step procedure, providing a wide diversity of derivatives on multigram scale with overall yields of 21–55%. Cheap or easily available acetanilides are used in an adapted aldolization with aldehydes, furnishing β-hydroxyamides with an 81% average yield over 21 examples. Special Mitsunobu conditions have been developed to ensure the cyclization of
N-芳基氮杂环丁烷可通过三步法有效地获得,以克数为单位提供种类繁多的衍生物,总收率为21-55%。廉价或容易获得的乙酰苯胺用于与醛类的缩醛醇缩醛化,可提供21个实例,平均收率达81%的β-羟酰胺。已经开发了特殊的Mitsunobu条件以确保这些羟酰胺的环化作用,在16个实例中,β-内酰胺的平均收率为73%。然后还原以高收率提供了N-芳基氮杂环丁烷。