An efficient synthesis of 1,3-cyclohexadienes from oxabicyclo[2.2.1]heptenes via tandem ring opening-Peterson elimination reactions
摘要:
Oxabicyclo[2.2.1]heptenes react with PhMe2SiLi or PhMe2SiCu.LiCN to yield 1,3-cyclohexadienes. The reaction pathway is shown to proceed via an addition-elimination-Peterson olefination sequence.
Convenient Synthesis of meso-Cyclohexa-1,3-dienes by One-Pot Two-Step Deoxygenation of 7-Oxabicyclo[2.2.1]hept-2-enes
作者:Ryo Irie、Tomotsugu Yano、Takashi Fujishima
DOI:10.1055/s-0029-1218618
日期:2010.3
Iron(III) hydroxide oxide was found to be an efficient catalyst for the ring-opening reaction of 5,6-cis-disubstituted 7-oxabicyclo[2.2.1]hept-2-enes with acetyl bromide in dichloromethane at room temperature to give cyclohexene derivatives with leaving groups (acetoxy or bromo groups) disposed on each allylic position. A successive one-pot treatment of the reaction mixture with zinc powder and tetrahydrofuran