Selective amidation by a photocatalyzed umpolung reaction
作者:Debasish Ghosh、Rajesh Nandi、Saikat Khamarui、Sukla Ghosh、Dilip K. Maiti
DOI:10.1039/c9cc01079c
日期:——
Herein, a metal-catalyzed organic transformation merged with another organophotocatalyst has been developed under mild conditions for the production of α-ketoamides.
Generation of Carbamoyl- and Thiocarbamoyllithium Synthons Having a Hydrogen(s) or an Aryl Group on the Nitrogen and Their Trapping with Carbonyl Electrophiles
Dimetalated amides 1 (Y = O) were generated as the synthons of carbamoyllithiums 2 (Y = O) by the reaction of isocyanates with iBu2AlTenBu and a subsequent tellurium-lithium exchange reaction. A series of amide derivatives 3 (Y = O) were obtained by the trapping of dianion 1 with electrophiles. This transformation can be successfully applied to the generation and trapping of thiocarbamoyllithium synthons 1 (Y = S) as well as to the nucleophilic introduction of the parent carbamoyl moiety H2NC(O).
Piperidine derivatives, their production, and polymers photostabilized thereby
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0141502B1
公开(公告)日:1989-01-25
High polymer stabilizer containing a phenolic compound, and high polymers stabilized thereby