A stereoselective total synthesis of (9S)-9-dihydroerythronolide A via coupling between the right-half (C1-C6) aldehyde and the left-half (C7-C15) sulfoxide.
作者:Hitoshi TONE、Takao NISHI、Yuji OIKAWA、Masataka HIKOTA、Osamu YONEMITSU
DOI:10.1248/cpb.37.1167
日期:——
As part of a study directed at the total synthesis of (9S)-9-dihydroerythronolide A, the C7-C15 sulfoxide, (2S, 3R, 4S, 5R, 6R, 7R)-3, 5-isopropylidenedioxy-7-(4-methoxybenzyloxy)-6-methoxymethoxy-1-phenylsulfinyl-2, 4, 6-trimethylnonane, was coupled with the C1-C6 aldehyde, (2R, 3S, 4S, 5R)-6-tert-butyldiphenylsilyloxy-3, 5-dimethyl-2, 4-isopropylidenedioxyhexanal, to give the C1-C15 hydroxysulfoxide, which was converted to the seco-acid via a stereocontrolled methylation at the C6 position. Macrocyclization of the seco-acid by Yamaguchi's method gave the 14-membered lactone, which was converted to (9S)-9-dihydroerythronolide A.
作为一项针对(9S)-9-二氢红霉素A的全合成研究的一部分,C7-C15亚砜(2S,3R,4S,5R,6R,7R)-3, 5-异丙烯基二氧基-7-(4-甲氧基苄氧)-6-甲氧基甲氧基-1-苯基亚砜基-2, 4, 6-三甲基壬烷与C1-C6醛(2R,3S,4S,5R)-6-叔丁基二苯基硅氧基-3, 5-二甲基-2, 4-异丙烯基二氧基己醛偶联,生成C1-C15羟基亚砜,该化合物通过在C6位点的立体控制甲基化转化为seco酸。通过Yamaguchi的方法对seco酸进行大环化反应,得到14元环内酯,最终转化为(9S)-9-二氢红霉素A。