sense of diastereoselective addition of 2-lithiothiazole 1a to the nitrone 2 derived from d-glyceraldehyde is reversed by the use of Lewis acids (Et2AlCl, TiCl4) as complexing agents; the configuration of the hydroxylamine adduct obtained from 1a and 2 in the absence of the above chelating agents, previously reported from these laboratories was revised.
                                    通过使用
路易斯酸(Et 2 AlCl,TiCl 4)作为络合剂,可以逆向将2-lithiothiazole 1a非对映选择性地添加到衍生自d-
甘油醛的硝酮2上。在这些
螯合剂不存在的情况下,由这些实验室先前报道的从1a和2获得的
羟胺加合物的构型被修改。