Phosphonate versus phosphorane method in the synthesis of higher carbon sugars. Preparation of D-erythro-L-manno-D-gluco-dodecitol
作者:Sławomir Jarosz、Mateusz Mach
DOI:10.1039/a807190j
日期:——
Higher sugar (C12 and C13) dialdose precursors 5, 10 and 15 were obtained by a coupling of C7-phosphorane 1 or C7-phosphonates 2 and 13 with C5- or C6-sugar aldehydes. These compounds were converted into higher dialdoses by (i) stereoselective reduction of a carbonyl group with zinc borohydride followed by (ii) osmylation of the resulting allylic alcohols. One of these derivatives – compound 8a – was
通过使C 7-膦烷1或C 7-膦酸酯2和13与C 5-或C 6-糖醛偶合而获得高级糖(C 12和C 13)二糖前体5、10和15 。通过(i)用硼氢化锌立体选择性地还原羰基,然后(ii)将所得的烯丙基醇进行甲磺酰化,从而将这些化合物转化为更高的二元醇。一这些衍生物的-化合物8a -被转换成d -赤-大号-甘露- d -葡糖-dodecitol 23上0.5g的规模。