Phospha-Michael Additions to Activated Internal Alkenes: Steric and Electronic Effects
作者:Heather K. Lenker、Marcia E. Richard、Kyle P. Reese、Anthony F. Carter、Jason D. Zawisky、Eric F. Winter、Timothy W. Bergeron、Krysta S. Guydon、Robert A. Stockland
DOI:10.1021/jo202183u
日期:2012.2.3
The addition of P(O)–H bonds to internal alkenes has been accomplished under solvent-free conditions without the addition of a catalyst or radical initiator. Using a prototypical secondary phosphine oxide, a range of substrates including cinnamates, crotonates, coumarins, sulfones, and chalcones were successfully functionalized. Highly activated acceptors such as isopropylidenemalononitrile and ethyl