Facile and Efficient Preparation of a C-1 Side Chain Equivalent of Zaragozic Acid C.
作者:Hiroki SATO、Jun-ichi KITAGUCHI、Sei-ichi NAKAMURA、Shun-ichi HASHIMOTO
DOI:10.1248/cpb.46.1816
日期:——
An optically pure C-1 side chain equivalent of zaragozic acid C, (4R, 5R)-4-benzyloxy-5-methyl-6-phenyl-1-hexyne, has been synthesized in ten steps from (E)-4-phenyl-2-buten-1-ol with an overall yield of 50%, involving a Sharpless asymmetric epoxidation as a key step, followed by regio- and stereocontrolled ring-opening of the epoxide with the trimethylaluminum/n-butyllithium system.
光学纯的C-1侧链类似物(4R, 5R)-4-苄氧基-5-甲基-6-苯基-1-己炔,已经在从(E)-4-苯基-2-丁烯-1-醇出发,经过十步反应合成,总产率为50%。该合成过程包括一步Sharpless不对称环氧化作为关键步骤,随后使用三甲基铝/正丁基锂体系进行区域选择性和立体选择性的环氧化物开环反应。