Practical Fischer glycosidation was effected at room temperature or 60°C by using 5 to 10 equiv. of TMSCl. The anomeric propargyl group formed by this method was found to be a versatile new protecting group, being stable in neat TFA but readily cleaved by treatment with Co2(CO)8 and TFA in CH2Cl2via the formation of an alkyne–Co complex.
在室温或60°C下,使用5到10当量的TMSCl,即可实现费舍尔糖苷化反应。通过这种方法形成的异构
丙炔基是一种多功能的新型保护基,在纯TFA中稳定,但通过在
CH2Cl2中用Co2(CO)8和TFA处理,形成炔-Co络合物,很容易被裂解。