Three-Component Direct Phosphorylation of Aldehydes and Alkylation of Ketones: Synthesis of γ-Ketophosphine Oxides under Acidic Conditions
作者:Xiao-Hong Wang、Ya-Wen Xue、Chun-Yuan Bai、Yan-Bin Wang、Xiao-Hong Wei、Qiong Su
DOI:10.1021/acs.joc.3c01674
日期:2023.12.1
and C–C bonds for the synthesis of γ-ketophosphine oxides with water as the only byproduct was developed. Detailed mechanistic experiments confirmed that the reaction proceeds by phospha-aldol elimination, in which a benzylic carbocation is generated from the phosphorylation of aldehydes, which then reacts with ketone enolates underacidicconditions.
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