Polysubstituted Oxygen Heterocycles by a Reformatsky-Type Reaction/Reductive Cyclization Approach from Enantiopure β-Ketosulfoxides
作者:Françoise Colobert、Sabine Choppin、Leticia Ferreiro-Mederos、Michel Obringer、Sandra Luengo Arratta、Antonio Urbano、M. Carmen Carreño
DOI:10.1021/ol701670g
日期:2007.10.1
The stereoselective synthesis of tetrasubstituted tetrahydrofurans and trisubstituted tetrahydropyrans bearing a sulfoxide was achieved by reductive cyclization (Et3SiH/TMSOTf) from the corresponding enantiopure hydroxy ketonesprotected as a dioxolane. These derivatives are easily accessible from a Reformatsky-type reaction between alpha-bromo-alpha'-sulfinyl ketones and protected alpha- or beta-ketoaldehydes