作者:Raymond J. Cvetovich、Brenda Pipik、Frederick W. Hartner、Edward J.J. Grabowski
DOI:10.1016/s0040-4039(03)01417-5
日期:2003.7
Hydrazines condense with dimethyl 2-pyrrolidino-4-oxo-2-pentenedioate in the presence of aq. HCl to form N-substituted pyrazole-3,5-dicarboxylates 2. Complex bicyclic derivatives, such as pyrazolo-oxazine 3a, pyrazolo-oxazepine 3b, pyrazolopyrazine 4a, and pyrazolo-diazepine 4b, were generated using 2-hydrazinoethanol, 3-hydrazinopropanol, 2-hydrazinoethylamine, and 3-hydrazinopropylamine. (C) 2003 Elsevier Ltd. All rights reserved.