Remarkable rate acceleration of water-promoted nucleophilic substitution of Baylis–Hillman acetate: a facile and highly efficient synthesis of N-substituted imidazole
作者:Jian Li、Xiaoxia Wang、Yongmin Zhang
DOI:10.1016/j.tetlet.2005.05.107
日期:2005.8
Without additional reagents, the Baylis–Hillman acetates 2 underwent nucleophilic substitution reaction with imidazole readily in aqueous THF solution to afford the corresponding N-substituted imidazole derivatives 3 in good to excellent yields. Moreover, the reaction between the in situ generated DABCO salt of Baylis–Hillman acetates 4 and imidazole occurs in aqueous THF providing the SN2 type products
在没有其他试剂的情况下,Baylis-Hillman乙酸酯2容易与咪唑在THF水溶液中进行亲核取代反应,从而以良好或优异的收率得到相应的N-取代的咪唑衍生物3。此外,原位生成的Baylis–Hillman乙酸盐4的DABCO盐与咪唑之间的反应发生在提供S N 2型产物5的THF水溶液中。与常规方法相比,更简单的操作程序,更好的立体选择性和更高的效率使本方案可用于制备咪唑衍生物。