BF3-induced cyclobutane-opening of verbenone and its deconjugate homolog. Efficient preparation of o-mentha-1,8-dien-3-one and o-menth-1-en-3-one in optically active forms
作者:Takashi Kusakari、Tsuyoshi Ichiyanagi、Hiroshi Kosugi、Michiharu Kato
DOI:10.1016/s0957-4166(98)00510-2
日期:1999.1
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。