γ-Lactone Formation in the Addition of Benzenesulfonyl Bromide to Diene and Enyne Esters
摘要:
The gem-dialkyl effect has been used to promote the formation of functionalized gamma-lactones in the addition of benzenesulfonyl bromide to diene and enyne esters. Introduction of 3 mol % of pyridine into the reactions increases the yields of lactones produced from tertiary esters. Formation of the C-alpha-C-beta bond of gamma-lactones has been achieved in both C-alpha-->C beta and C-beta-->C-alpha radical cyclization directions.
Friedel–Crafts allylation of 2-(benzyloxy)-3,4,5-trimethoxytoluene Catalysed by a Metal Trifluoromethanesulfonic Salt: Synthesis of Coenzyme Q10
作者:Yun-Feng Zheng、Jing-Du Lin、Cheng-Ping Li、Jing-Hua Li
DOI:10.3184/030823407x270338
日期:2007.12
In the presence of a catalytic amount of scandium triflate, 2-benzyloxy-3,4,5-trimethoxytoluene reacted with allylic derivatives 4, giving the key intermediate 3 (R = benzyl) which was used for preparing coenzyme Q10, in moderate to high yields.
γ-Lactone Formation in the Addition of Benzenesulfonyl Bromide to Diene and Enyne Esters
作者:Chen Wang、Glen A. Russell
DOI:10.1021/jo982388a
日期:1999.3.1
The gem-dialkyl effect has been used to promote the formation of functionalized gamma-lactones in the addition of benzenesulfonyl bromide to diene and enyne esters. Introduction of 3 mol % of pyridine into the reactions increases the yields of lactones produced from tertiary esters. Formation of the C-alpha-C-beta bond of gamma-lactones has been achieved in both C-alpha-->C beta and C-beta-->C-alpha radical cyclization directions.