Models for the Carbonyl-ene Cyclization Reaction: Open and Closed Transition States
作者:D. Christopher Braddock、King Kuok (Mimi) Hii、John M. Brown
DOI:10.1002/(sici)1521-3773(19980703)37:12<1720::aid-anie1720>3.0.co;2-w
日期:1998.7.3
Different cyclization products are formed with different Lewis acids in the ene cyclization of 5-hexenals (see scheme on the right; a: methylaluminum bisphenoxide, b: Me2 AlCl, c: Sc(OSO2 CF3 )3 ). This is not surprising, but it is gratifying that these result can be rationalized with an internally consistent model.