Chiral synthesis of polyketide-drived natural products. 43. Stereoselective synthesis of optically active 4-ethyl-3,5-dihydroxy-2-methylpentyl derivatives. A basic building block with three contiguous chiral centers of polyether antibiotics.
作者:Kiyoshi HORITA、Kazuhiro TANAKA、Osamu YONEMITSU
DOI:10.1248/cpb.41.2044
日期:——
Optically active 4-ethyl-3, 5-dihydroxy-2-methylpentyl derivatives, the iodide (4), phenyl sulfone (5), and phenyl sulfoxide (6), which are chiral synthons for an essential structural unit of polyether antibiotics, were stereoselectively synthesized starting from commercially available methyl (2S)-3-hydroxy-2-methylpropionate (7) in good overall yield (33% for 18 steps).
具有光学活性的4-乙基-3,5-二羟基-2-甲基戊基衍生物碘化物(4)、苯砜(5)和苯亚砜(6)是聚醚类抗生素重要结构单元的手性合成单元,可从市售的(2S)-3-羟基-2-甲基丙酸甲酯(7)出发,以立体选择性方式合成,总收率较高(18步合成,收率为33%)。