Starting with (+)-verbenone, readily obtainable from (+)-nopinone, enantioselective preparation of (S)-(+)-4-isopropenyl-, (S)-(−)-4-isopropyl- and (R)-(+)-4-(1-acetoxy-1-methylethyl)-3-methyl-2-cyclohexen-1-ones was accomplished with little loss of stereochemical integrity via BF3-induced cyclobutane-opening of (+)-4-(methylene)nopinone. As we have developed an efficient chemical transformation of
以(+)-马洛酮为原料,可容易地从(+)-壬皮酮获得,对映选择性制备(S)-(+)-4-异
丙烯基- ,(S)-(-)-4-异丙基-和(R)- (+)-4-(1-乙酰氧基-1-甲基乙基)-
3-甲基-2-环己烯-1-酮是通过BF 3诱导的(+)-4-
环丁烷开口而失去立体
化学完整性的(亚甲基)nopinone。由于我们已经开发出从(+)-壬基酮到(-)-马来酮的有效
化学转化方法,上述
环己烯酮的当前合成是它们的对映异构体由(+)-壬基酮的形式合成。