ethyl 2,6-anhydro-3-deoxy-2-(hydroxymethyl)-4,5:7,8-di-O-isopropylidene-D-glycero-D-galacto-octonate 、
溴甲苯 生成 ethyl (3aR,4R,6S,7aR)-4-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2,2-dimethyl-6-(phenylmethoxymethyl)-3a,4,7,7a-tetrahydro-[1,3]dioxolo[4,5-c]pyran-6-carboxylate