Zinc- and Indium-Mediated Ring-Expansion Reaction of α-Halomethyl Cyclic β-Keto Esters in Aqueous Alcohol
作者:Masaaki Sugi、Daisuke Sakuma、Hideo Togo
DOI:10.1021/jo030092l
日期:2003.10.1
Radical ring-expansion reaction of various alpha-halomethyl cyclic beta-keto esters and alpha-halomethyl benzocyclic beta-keto esters and chain-extension reaction of alpha-halomethyl beta-keto esters with zinc powder and indium powder in refluxing aqueous alcohol were carried out to generate the corresponding ring-expansion and chain-extension products. As the results indicate, it was found zinc powder
A new tributyltin hydride-based rearrangement of bromomethyl .beta.-keto esters. A synthetically useful ring expansion to .gamma.-keto esters
作者:Paul Dowd、Soo Chang Choi
DOI:10.1021/ja00245a069
日期:1987.5
DOWD, PAUL;CHOI, SOO-CHANG, TETRAHEDRON, 45,(1989) N, C. 77-90
作者:DOWD, PAUL、CHOI, SOO-CHANG
DOI:——
日期:——
DOWD P.; CHOI SOO-CHANG, J. AMER. CHEM. SOC., 109,(1987) N 11, 3493-3494
作者:DOWD P.、 CHOI SOO-CHANG
DOI:——
日期:——
Novel free radical ring-expansion reactions
作者:Paul Dowd、Soo-Chang Choi
DOI:10.1016/0040-4020(89)80035-3
日期:1989.1
A novelfreeradical initiated ring expansion of haloalkyl β-keto esters is described. Following alkylation of the β-keto ester with the appropriate dihalide, the resulting halide is treated at reflux with tri-n-butyltin hydride. Rearrangement to the homologated γ-keto ester occurs smoothly. An oxy radical intermediate is proposed for the reaction.