Organoalane-mediated isomerization of ascorbic and isoascorbic acid derivatives
作者:Josef Schachtner、Hans-Dietrich Stachel
DOI:10.1016/0957-4166(96)00427-2
日期:1996.11
removal of the protecting groups is effected by hydrogenolysis of the benzylidene acetals ent-10 and ent-11a. This reaction leads to d-ascorbic acid ent-1a or l-isoascorbic acid ent-1b, respectively. Furthermore, the four acetonides 2 were converted by ozonolysis, transesterification and finally catalytic hydrogenation to the threonic and erythronic acid ketals 9.