Concise synthesis of optically active oxirane precursors for the preparation of triazole antifungals using the Friedel-Crafts reaction of (S)-2-tosyloxypropionyl chloride
作者:Toshiyuki Konosu、Yawara Tajima、Takeo Miyaoka、Sadao Oida
DOI:10.1016/0040-4039(91)80530-j
日期:1991.12
Optically active epoxide (2R,3S)-4, a key intermediate for the preparation of triazole antifungal agents (4R,5R)-1 and (2R,3R)-2 (X=2,4-F2), was synthesized. The Friedel-Crafts reaction between the (S)-lactic acid derivative (S)-10 and m-difluorobenzene gave the (R)-2-chloropropiophenone derivative (R)-11, which was converted into (2R,3R)-18 with sodium triazolide gave (2R,3S)-4. Similarly, the 4-chlorophenyl
合成了光学活性环氧化物(2R,3S)-4,这是制备三唑抗真菌剂(4R,5R)-1和(2R,3R)-2(X = 2,4-F 2)的关键中间体。(S)-乳酸衍生物(S)-10与间二氟苯之间的弗瑞德-克来福特反应产生(R)-2-氯丙苯甲酮衍生物(R)-11,将其转化为(2R,3R)-18用三唑啉钠得到(2R,3S)-4。类似地,制备了4-氯苯基类似物(2R,3S)-4'。