[EN] A METHOD OF PREPARING ENANTIOMERS OF INDOLE-2,3-DIONE-3-OXIME DERIVATIVES [FR] PROCEDE DE PREPARATION D'ENANTIOMERES DE DERIVES D'INDOLE-2,3-DIONE-3-OXIME
[EN] A METHOD OF PREPARING ENANTIOMERS OF INDOLE-2,3-DIONE-3-OXIME DERIVATIVES [FR] PROCEDE DE PREPARATION D'ENANTIOMERES DE DERIVES D'INDOLE-2,3-DIONE-3-OXIME
New lactone synthesis using a chromium carbene complex
作者:Taro Ishibashi、Nagisa Ochifuji、Miwako Mori
DOI:10.1016/0040-4039(96)01338-x
日期:1996.8
A new lactone synthesis was developed using the Fischer chromiumcarbenecomplex. The lactone was formed from an alkyne bearing a hydroxyl or silyloxyl group in a tether, along with carbene carbon and carbon monoxide of the chromiumcarbenecomplex. Using this procedure, (+)-blastmycinone and (+)-antimycinone were synthesized from (S)-ethyl lactate in short steps.
Radical reaction of acetonyltributylstannane 1 with α-(phenylseleno)carbonylcompounds 2 gave 1,4-dicarbonyl compounds in high yield. The SH2′ mechanism via the stannyl enolate in equilibrium with acetonylstannane is postulated.
丙酮基三丁基锡烷1与α-(苯基硒代)羰基化合物2的自由基反应以高收率得到1,4-二羰基化合物。推测通过与苯乙烯基锡烷平衡的苯乙烯基烯醇酸酯的S H 2'机理。
Mizoroki–Heck type reactions and synthesis of 1,4-dicarbonyl compounds by heterogeneous organic semiconductor photocatalysis
作者:Jagadish Khamrai、Saikat Das、Aleksandr Savateev、Markus Antonietti、Burkhard König
DOI:10.1039/d0gc03792c
日期:——
We report the synthesis of 1,4-dicarbonylcompounds and substituted alkenes (Mizoroki–Heck type coupling) starting from secondary and tertiary alkyl halides and vinyl acetate or styrenederivatives using visible-light photocatalysis. The protocol uses mesoporous graphitic carbon nitride (mpg-CN) as a heterogeneous organic semiconductor photocatalyst and Ni(II) salts as Lewis acid catalysts. Detailed