Regio- and stereoselective fluorinative ring-opening reaction of epoxyalcohols by (i-PrO)2TiF2-Et4NF-nHF. Synthesis of optically active 3-fluoro-1,2-diols
作者:Shoji Hara、Takuro Hoshio、Mikio Kameoka、Masataka Sawaguchi、Tsuyoshi Fukuhara、Norihiko Yoneda
DOI:10.1016/s0040-4020(99)00180-5
日期:1999.4
regioselective ring opening reaction of epoxyalcohols was achieved by (i-PrO)2TiF2 and Et4NF-nHF under mild conditions. Fluoride attacked the epoxide at the C3 carbon with the inversion of the stereochemistry to give 3-fluoro-1,2-diols selectively. When optically active epoxyalcohols were used as the starting material, the corresponding 3-fluoro-1,2-diols were obtained with high optical purity.
(i-PrO)2 TiF 2和Et 4 NF-nHF在温和条件下实现了环氧醇的立体和区域选择性开环反应。氟化物通过立体化学的转化攻击了C3碳上的环氧化物,从而选择性地生成3-氟-1,2-二醇。当使用光学活性环氧醇作为起始原料时,获得具有高光学纯度的相应的3-氟-1,2-二醇。