Bridgehead dienes. Thermal generation of the bicyclo[3.3.1]nona-1(2),4(5)-diene (ZZ) ring system
作者:K.J. Shea、L.D. Burke
DOI:10.1016/s0040-4039(01)80975-8
日期:1987.1
The bicyclo[3.3.1]nona-1(1),4(5)-diene (ZZ) ring system has been generated by intramolecular Diels-Alder cycloaddition of methyl 7-methylene-non-2-yn-8-enoate. This highly strained bridgehead diene undergoes a homo 1,5-hydrogen shift to yield a [3.3.1] propellane product.
双环[3.3.1] nona-1(1),4(5)-二烯(ZZ)环系统是通过分子内Diels-Alder环加成7-亚甲基-non-2-yn-8-甲基丙烯酸甲酯而生成的。这种高度应变的桥头二烯经历了均一的1,5-氢转移,生成了[3.3.1]丙炔产品。