Process Research, Development, and Pilot-Plant Preparation of Clofencet, a Novel Wheat Hybridizing Agent: Lewis Acid-Catalyzed Reaction of Ethyl Diazoacetate with 4-Chlorophenyl Hydrazonoacetaldehyde
作者:Jerry D. Clark、Jerald D. Heise、Ajit S. Shah、James C. Peterson、Shine K. Chou、Jeffrey Levine、Achilles M. Karakas、Yinong Ma、Kin-Yin Ng、Lefteris Patelis、John R. Springer、Don R. Stano、Richard H. Wettach、Gerard A. Dutra
DOI:10.1021/op034123q
日期:2004.3.1
effective manner, and the Lewis acid-catalyzed reaction of 28 with hydrazonoacetaldehyde 29, affording β-ketoester 30. The synthesis is completed via propionylation of 30, acid-catalyzed cyclization of 31 to pyridazinecarboxylic acid ester 32, followed by saponification and isolation of carboxylic acid 9. The results and challenges of eight pilot-plant runs are reported. The baseline process developed produced
Synthesis of 4,5-dihydro-pyrazolo[3,4-c]pyrid-2-ones
申请人:Bristol-Myers Squibb Company
公开号:US07153960B2
公开(公告)日:2006-12-26
A novel process and intermediates thereof for making 4,5-dihydro-pyrazolo[3,4-c]pyrid-2-ones of the type shown below from appropriate phenyl hydrazines is described.
These compounds are useful as factor Xa inhibitors.
SYNTHESIS OF 4,5-DIHYDRO-PYRAZOLO[3,4-C]PYRID-2-ONES
申请人:Zhou Jiacheng
公开号:US20070027186A1
公开(公告)日:2007-02-01
A novel process and intermediates thereof for making 4,5-dihydro-pyrazolo[3,4-c]pyrid-2-ones of the type shown below from appropriate phenyl hydrazines is described.
These compounds are useful as factor Xa inhibitors.