A new synthesis, including asymmetric synthesis, of spiro[4.n]alkenones from three components: cyclic ketones, chloromethyl p-tolyl sulfoxide, and acetonitrile; and a formal total synthesis of racemic acorone
作者:Tsuyoshi Satoh、Tadashi Kawashima、Satoru Takahashi、Ken Sakai
DOI:10.1016/j.tet.2003.09.099
日期:2003.11
synthesized from several kinds of cyclic ketones and chloromethyl p-tolyl sulfoxide in good yields. Treatment of the 1-chlorovinyl p-tolyl sulfoxides with cyanomethyllithium at −78°C to room temperature gave spirocyclic enaminonitriles in high yields. Acidic treatment of the enaminonitriles afforded spiro[4.n]alkenones in good yields. By using an unsymmetrical cyclic ketone, α-tetralone, and optically active
由几种环酮和氯甲基对甲苯基亚砜合成了1-氯代戊酰基对甲苯基亚砜,收率很高。在-78°C到室温下,用氰基甲基锂处理1-氯乙烯基对甲苯基亚砜,可以高收率得到螺环烯腈。烯丙腈的酸性处理可得到螺[4]。n ]烯酮,收率高。通过使用不对称的环状酮,α-四氢萘酮和光学活性的氯甲基p-甲苯基亚砜,此方法可提供对映体纯的螺[4.5]癸烯酮,收率高,并且从亚砜手性中心具有出色的不对称诱导性。通过使用该方法,实现了外消旋的螺环倍半萜烯,阿科隆的正式全合成。