catalyzed decomposition of vinyldiazomethanes to vinylcarbenoids in the presence of oxygenated dienes leads to the regioselective synthesis of cycloheptadienes by a tandem cyclopropanation/Cope rearrangement. The resulting cycloheptadienes are readily hydrolyzed and oxidized, leading to a very direct and general synthesis of highly functionalized tropolones.
在氧化二烯存在下,
铑(II)催化的
乙烯基重氮甲烷分解为
乙烯基类
胡萝卜素可通过串联
环丙烷化/ Cope重排反应导致环庚二烯的区域选择性合成。所得的环庚二烯易于
水解和氧化,导致高度官能化的
对苯二酚的非常直接和一般的合成。