Remote Chiral Induction in Vinyl Sulfonium Salt-Mediated Ring Expansion of Hemiaminals into Epoxide-Fused Azepines
作者:Muhammad Yar、Matthew G. Unthank、Eoghan M. McGarrigle、Varinder K. Aggarwal
DOI:10.1002/asia.201000817
日期:2011.2.1
The planet of the azepines: Epoxy‐fused azepines have been synthesized in a highly selective reaction with hemiaminals and vinyl sulfonium salts. Stereochemistry is controlled by the substituent at the four‐ or five‐position of the hemiaminal. The key step involves ring‐opening of the hemiaminal, conjugate addition onto a vinyl sulfonium salt, and epoxidation of the aldehyde by the in situ formed sulfur
ze庚烷的星球:环氧稠合的ze庚烷是通过与hemiaminals和乙烯基sulf盐的高度选择性反应而合成的。立体化学是由半胱氨酸的4位或5位上的取代基控制的。关键步骤包括打开半胱氨酸开环,将共轭物加到乙烯基sulf盐上,以及通过原位形成的硫叶立德将醛环氧化。