The preparation of ethyl 7-alkyl-2,3,6,7-tetrahydro-4-alkyl-2-oxo-1H-1,3-diazepine-5-carboxylates 2 by a one pot ring expansion-nucleophilic addition of ethyl 4-chloromethyl-1,2,3,4-tetraydro-6-alkyl-2-oxopyrimidine-5-carboxylates 1 is described.
本发明描述了通过 4-
氯甲基-1,2,3,4-四氢-6-烷基-2-氧代-1H-1,3-二氮杂卓-5-
羧酸乙酯 1 的一锅扩环-亲核加成制备 7-烷基-2,3,6,7-四氢-4-烷基-2-氧代-1H-1,3-二氮杂卓-5-
羧酸乙酯 2 的过程。