Diastereoselective Intramolecular Alder−Ene Reaction on Chiral Perhydro-1,3-benzoxazines. A Rapid Entry to Enantiopure <i>cis</i>-3,4-Disubstituted Pyrrolidines
作者:Rafael Pedrosa、Celia Andrés、Laura Martín、Javier Nieto、Carlos Rosón
DOI:10.1021/jo050360a
日期:2005.5.1
Chiral 3-acryloyl-2-vinyl-substituted 1,3-perhydrobenzoxazines derived from (−)-8-aminomenthol participate in an ene reaction leading to 3,4-disubstituted pyrrolidinone derivates with excellent diastereoselectivity. The cycloadducts were transformed into enantiopure 3,4-disubstituted pyrrolidines after elimination of the chiral adjuvant.
衍生自(-)-8-氨基薄荷醇的手性3-丙烯酰基-2-乙烯基取代的1,3-全氢苯并恶嗪参与烯键反应,生成具有优异非对映选择性的3,4-二取代吡咯烷酮衍生物。消除手性佐剂后,将环加合物转化为对映体纯的3,4-二取代的吡咯烷。