A new method for the synthesis of 3-chromanol derivatives by sodium iodide-catalyzed cyclization of epoxide.
作者:Kiyoshi KAWAMURA、Tomio OHTA、Genji OTANI
DOI:10.1248/cpb.38.2088
日期:——
Treatment of 2-(2, 3-epoxy)propylphenyl acetate derivatives with catalytic amounts of NaI in organic solvent gave directly the corresponding 3-chromanyl acetate derivatives in good yields (86.6-98.0%). Similar treatment of 2-(2, 3-epoxy)propyl-6-methoxyphenyl N-mesyl-L-phenylalanylate gave a diastereomeric mixture of 8-methoxy-3-chromanyl N-mesyl-L-phenylalanylate, which was fractionated into both diatereomers by silica gel column chromatography. Subsequent hydrolysis of these isomers afforded the enantiomers of 8-methoxy-3-chromanol.
将2-(2, 3-环氧)丙基苯乙酸酯衍生物用催化量的NaI在有机溶剂中处理,直接获得了相应的3-色烯酰酸酯衍生物,产率良好(86.6-98.0%)。类似地,2-(2, 3-环氧)丙基-6-甲氧基苯基N-美克酰-L-苯丙氨酸酯的处理产生了一种二对映体混合物的8-甲氧基-3-色烯体N-美克酰-L-苯丙氨酸酯,通过硅胶柱层析分离出两个对映体。随后对这些异构体进行水解,得到了8-甲氧基-3-色醇的对映体。