作者:Ken-ichi Takao、Nobuhiko Hayakawa、Reo Yamada、Taro Yamaguchi、Hiroshi Saegusa、Masatoshi Uchida、Suguru Samejima、Kin-ichi Tadano
DOI:10.1021/jo9012546
日期:2009.9.4
An enantioselective total synthesis of both enantiomers of caryophyllene-type sesquiterpenoid pestalotiopsin A has been achieved, thereby establishing the absolute stereochemistry of natural (+)-pestalotiopsin A. Highlights of the synthesis include a [2 + 2] cycloaddition of N-propioloyl Oppolzer’s camphorsultam and ketene dialkyl acetal and subsequent highly stereoselective 1,4-hydride addition/protonation
一个对映体的全合成的叶绿素型倍半萜类香蒜素A的对映体已经实现,从而建立了天然(+)-脂蛋白A的绝对立体化学。该合成的重点包括N-丙炔基Oppolzer樟脑的[2 + 2]环加成。乙烯酮二烷基乙缩醛,随后的高立体选择性1,4-氢化物加成/质子化,功能化的双环内酯与醛的醛醇缩合反应,高效的分子内Nozaki-Hiyama-Kishi(NHK)反应,用于构建高应变(E)-环壬烯环,以及钯催化的烯丙基甲磺酸酯的还原,同时保留了E构型。