作者:Masaya Nakata、Tomomasa Osumi、Ari Ueno、Takenori Kimura、Tetsuro Tamai、Kuniaki Tatsuta
DOI:10.1246/bcsj.65.2974
日期:1992.11
to our developed procedure, by using a regioselective epoxide opening [bis(1,2-dimethylpropyl)borane–NaBH4] and a stereoselective hydroboration (BH3·SMe2) as the key steps. This aldehyde 40 was subjected to the Brown’s diastereo- and enantioselective allylation conditions [[(Z)-3-methoxyallyl]diisopinocampheylborane] to afford the desired syn 3-methoxy-1,5-dodecadien-4-ol derivative. Subsequent three-step
描述了除草霉素 A (1)、苯醌类安沙霉素抗生素的首次全合成。(2E,4S,5R,6S,8S)-5,6-二甲氧基-9-(4-甲氧基苄基)氧基-2,4,8-三甲基-2-壬烯醛 (40),对应于1 的 ansa 链是由甲基 3,4-anhydro-2-deoxy-2-C-methyl-6-O-(triphenylmethyl)-α-D-altropyranoside (16) 制备的根据我们开发的程序,通过使用区域选择性环氧化物开环[双(1,2-二甲基丙基)硼烷-NaBH4]和立体选择性硼氢化反应(BH3·SMe2)作为关键步骤,制备甲基α-D-吡喃甘露糖苷。将此醛 40 进行布朗的非对映选择性和对映选择性烯丙基化条件 [[(Z)-3-甲氧基烯丙基] 二异松蒎基硼烷] 以提供所需的顺式 3-甲氧基-1,5-十二碳二烯-4-醇衍生物。