中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | methyl 2-((diphenylmethylene)amino)pent-4-ynoate | 167904-79-2 | C19H17NO2 | 291.349 |
二苯亚甲基甘氨酸甲酯 | ethyl N-benzhydrylideneglycinate | 81167-39-7 | C16H15NO2 | 253.301 |
A procedure for the enantioselective synthesis of α-substituted glutamates and pyroglutamates via a cyclopropenimine-catalyzed Michael addition of amino ester imines is described. Enantioselectivities of up to 94% have been achieved, and a variety of functional groups were found to be compatible. The impact of the catalyst structure and imine substitution is discussed. Compared to other methods, this protocol allows for a broader and more enantioselective access to pyroglutamate derivatives.