Photochemical rearrangement of α-chloro-propiophenones to α-arylpropanoic acids: studies on chirality transfer and synthesis of (S)-(+)-ibuprofen and (S)-(+)-ketoprofen
作者:Harikisan R. Sonawane、Nanjundiah S. Bellur、Dilip G. Kulkarni、Nagaraj R. Ayyangar
DOI:10.1016/s0040-4020(01)80835-8
日期:1994.1
α-arylpropanoic acids (4) from α chloro-propiophenones (5) is described. It involves carbonyl triplet excited state directed 1,2-aryl migration of the aryl group which has been found to be highly dependent upon the nature of the aryl substituent. The mode of this rearrangement is probed by the study of the photobehaviour of a set of opticallyactive α-chloro-propiophenones. The results suggest that the nature of
Light-mediated direct transformation of 2-chloro-propiophenones into 2-arylpropionic acids
作者:Harikisan R Sonawane、Dilip G Kulkarni、Nagaraj R Ayyangar
DOI:10.1016/s0040-4039(00)88526-3
日期:1990.1
A strategy based on photochemical 1,2-aryl migration as the pivotal step allows efficient transformation of 2-chloro-propiophenones into 2-arylpropionic acids. A noticeable substituent-directed excited state control on the rearrangement process has been observed.
Process for the preparation of .alpha.-arylalkanoic acids
申请人:Mine Safety Appliances Company
公开号:US04910337A1
公开(公告)日:1990-03-20
.alpha.-Arylalkanoic acids are prepared by a method comprising the step of reacting an alkylaromatic compound corresponding to the desired .alpha.-arylalkanoic acid with a new metallation reagent solution. The reagent comprises the reaction product of alkyllithium or aryllithium and about two to five molar equivalents of potassium tert-alkoxide in a trialkylamine solvent.
.alpha.-Arylalkanoic acids are prepared by a method comprising the step of reacting an alkylaromatic compound corresponding to the desired .alpha.-arylalkanoic acid with a new metallation reagent solution. The reagent comprises the reaction product of alkyllithium or aryllithium and about two to five molar equivalents of potassium tert-alkoxide in a trialkylamine solvent.