Singh, Om V.; George, Varughese; Kapil, Randhir S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1995, vol. 34, # 10, p. 856 - 864
Hydroxyacetic acid derivatives for the treatment of diabetic
申请人:Pfizer Inc.
公开号:US04853410A1
公开(公告)日:1989-08-01
Racemic and chiral (2R,4R)-4-c-hydroxy-2-4-(substituted)chroman(and thiochroman)-4-acetic acids and their pharmaceutically acceptable salts, their use in the treatment of diabetic complications and intermediates therefor.
A simple route for the synthesis of 4-chlorochromenes and chroman-4-ones
作者:G. Ariamala、K.K. Balasubramanian
DOI:10.1016/0040-4039(88)85197-9
日期:1988.1
A one pot synthesis of a number of 4-chlorochromenes and chroman-4-ones was achieved from γ-chloropropargyl aryl ethers proceeding through Claisen rearrangement, depending upon the solvent of choice.
A systematic study of the behaviour of aryl γ-halopropargyl ethers under thermal condition was undertaken. Aryl γ-bromopropargyl ethers underwent unique transformation in N,N-diethylanillne (215°C, 6 h) giving rise to a mixture of products ,and , whereas, under similar conditions aryl γ-chloropropargyl ethers ulbar|8, afforded 4-chlorochromenes, 9. A remarkable substituent and solvent effect has been
Synthesis of chromanones: a novel palladium-catalyzed Wacker-type oxidative cyclization involving 1,5-hydride alkyl to palladium migration
作者:Zuhui Zhang、Chongfeng Pan、Zhiyong Wang
DOI:10.1039/b711613f
日期:——
A series of 2-methylchromanone derivatives have been prepared by using a novelpalladium-catalyzed Wacker-type oxidative cyclization, in which a 1,5-hydride alkyl to palladium migration and a direct chirality transfer were involved.