Diels-Alder Reactions of Ethyl α-Bromoacrylate with Open-chain Dienes-Synthesis of Ethyl 1,3-/ 1,4-Cyclohexadienecarboxylates
作者:Yingjie Li、Quanrui Wang、Goeke Andreas
DOI:10.1002/cjoc.201090121
日期:——
The Diels‐Alder reactions of ethyl α‐bromoacrylate 1 with open‐chain dienes 2 were conducted under thermal or Lewis acid‐catalysis conditions. In most cases, the cyclic adducts of 1‐bromocyclohex‐3‐enecarboxylates 3 were formed in high yields with good regio‐ and stereoselectivity. Subsequent E2‐elimination by treatment with DBU provided the corresponding 1,3‐ or 1,4‐cyclohexadienecarboxylates depending