A convenient one-pot synthesis of 4-amino-3-arylpyrazoles from α-phthaloylaminoacetophenones
作者:Chen Chen、Keith Wilcoxen、James R. McCarthy
DOI:10.1016/s0040-4039(98)01776-6
日期:1998.11
Condensation of alpha-phthaloylaminoacetophenones 1a-c with N,N-dimethylformamide dimethyl acetal afforded the novel enamines 3a-c. Cyclization of 3 with hydrazine, alkylhydrazine or phenylhydrazine salts (4a-d) gave 4-phthaloylamino-3-arylpyrazoles 7-9 in high yields. Deprotection of 7-9 was accomplished with hydrazine to provide 4-amino-3-arylpyrazoles 5 in good yields. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis of 3-phenylpyrazolo[4,3-b]pyridines via a convenient synthesis of 4-amino-3-arylpyrazoles and SAR of corticotropin-Releasing factor receptor type-1 antagonists
作者:Keith Wilcoxen、Charles Q Huang、James R McCarthy、Dimitri E Grigoriadis、Chen Chen
DOI:10.1016/s0960-894x(03)00621-8
日期:2003.10
3-Phenylpyrazolo[4,3-b]pyridines were synthesized via a cyclization of 4-amino-3-phenylpyrazoles 11-13 with ethyl acetoacetate. These compounds were found to be potent CRF1 antagonists. The 2-alkylpyrazolo[4,3-b]pyridines were more polar but less active than the corresponding 1-alkyl-isomers. (C) 2003 Elsevier Ltd. All rights reserved.