作者:Michael H. Brookes、Bernard T. Golding、Alan T. Hudson
DOI:10.1039/p19880000009
日期:——
(S)-Malic acid has been converted into α-(R)- and α-(S)-lipoic acid [(1a) and (1b), respectively]via(R)- and (S)-(2-phenylmethoxyethyl)oxirane [(2a) and (2b), respectively]. The (R)-oxirane (2a) was cleaved with but-3-enylmagnesium bromide (cuprate catalysis) to give (S)-1-(phenylmethoxy)oct-7-en-3-ol (4a). This was converted into methyl (S)-6,8-dihydroxyoctanoate (5a), the di-O-methanesulphonate (6a)
(S)-苹果酸已通过(R)-和(S)-(2-苯基甲氧基乙基)分别转化为α-(R)-和α-(S)-硫辛酸[分别为((1a)和(1b)]] 。)环氧乙烷[分别为((2a)和(2b)]。将(R)-环氧乙烷(2a)用3-丁烯基溴化镁裂解(铜酸盐催化),得到(S)-1-(苯基甲氧基)oct-7-en-3-醇(4a)。将其转化为(S)-6,8-二羟基辛酸甲酯(5a),二-O-甲磺酸酯(用硫化钠和硫在二甲基甲酰胺中处理其中的6a),得到α-(R)-硫辛酸甲酯(7a),将其皂化为α-(R)-硫辛酸(1a)。(S)-环氧乙烷(2b)类似地转化为α-(S)-硫辛酸(1b)。