Enantioselective Construction of Single and Vicinal All-Carbon Quaternary Stereocenters through Ion-Pair-Catalyzed 1,6-Conjugate Addition
作者:Yasheng Zhu、Hongliang Wang、Gang Wang、Zehua Wang、Zhaopeng Liu、Lei Liu
DOI:10.1021/acs.orglett.1c02640
日期:2021.9.17
An asymmetric 1,6-conjugate addition to presynthesized δ-aryl-δ-cyano-disubstituted para-quinone methides through bifunctional phosphonium-amide-promoted ion-pair catalysis for acyclic all-carbon quaternarystereocenterconstruction has been described. Both acyclic and cyclic 1,3-dicarbonyls participate in the asymmetricalkylationreaction, furnishing a wide array of diarylmethanes bearing a single
PROCESS FOR PRODUCTION OF KETOMALONIC ACID COMPOUNDS OR HYDRATES THEREOF
申请人:Tani Shinki
公开号:US20120004443A1
公开(公告)日:2012-01-05
Disclosed is a process for the production of ketomalonic acid compounds or hydrates thereof by reacting a malonic acid compound with one or more chlorous acid compounds selected from among chlorous acid and chlorites and thus oxidizing the methylene group of the malonic acid compound. The process does not necessitate highly toxic reagents, lowly safe reagents, special reactants, special reaction equipment, expensive reagents, expensive catalysts, or transition metals such as noble metals, and permits the selection of mild reaction conditions and simple operation, thus enabling efficient and easy production of ketomalonic acid compounds such as ketomalonic diesters under simple and easy conditions suitable for industrialization.