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
Gold(I)-Catalyzed Rearrangement of <i>N</i>-Aryl 2-Alkynylazetidines to Pyrrolo[1,2-<i>a</i>]indoles
作者:Nicolas Kern、Marie Hoffmann、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/ol303518n
日期:2013.2.15
Various N-aryl-2-alkynylazetidines were very efficiently converted to pyrrolo[1,2-a]indoles with gold catalysts, especially the 2-biphenyl-dicyclohexylphosphino-gold(I) hexafluoroantimonate, in dichloromethane at room temperature. Additionally, two formal syntheses of bioactive non-natural compounds, i.e. 7-methoxymitosene and an 5-HT2C receptor agonist, have been achieved.
在室温下,用金催化剂,尤其是2-联苯基-二环己基膦基-金(I)六氟锑酸盐,将各种N-芳基-2-炔基氮杂环丁烷非常有效地转化为吡咯并[1,2- a ]吲哚。另外,已经实现了两种具有生物活性的非天然化合物的正式合成,即7-甲氧基米托烯和5-HT 2C受体激动剂。