Ligand exchange acetalization of acetals in the presence of catalytic amounts of mandelic acid and titanium tert-butoxide is reported. This transformation is successfully extended to glycosylation of unprotected and unactivated pentoses. Even unreactive pentoses such as d-arabinose or d-lyxose can be transformed by this new methodology into corresponding isopropyl glycosides.
据报道,在催化量的
扁桃酸和
叔丁醇钛存在下,
乙缩醛的
配体交换
缩醛化。该转化成功地扩展到未保护和未激活的戊糖的糖基化。甚至不反应的戊糖,例如d-
阿拉伯糖或d- lyxose,也可以通过这种新方法转化为相应的
异丙基糖苷。