Investigation of the synthesis and analgesic activity of 1-substituted 4-(propananilido)perhydroazepines
作者:Jack Deruiter、Shridhar Andurkar、Thomas N. Riley、Donald E. Walters、F. Taylor Noggle
DOI:10.1002/jhet.5570290417
日期:1992.7
Methods are explored to enhance the efficiency and versatility of the synthesis of the 1-substituted4-(propananilido)perhydroazepineanalgesics. The modified synthesis begins with ring expansion of 1-carbethoxy-4-piperidinone 3 with ethyl diazoacetate and boron trifluoride to yield 1,5-biscarbethoxyperhydroazepin-4-one 4. Selective hydrolysis of 4 followed by decarboxylation provides 1-carbethoxy