CANTOS, ALBERT;MARCH, PEDRO DE;MORENO-MANAS, MARCIAL;PLA, ANNA;SANCHEZ-FE+, BULL. CHEM. SOC. JAP., 60,(1987) N 12, # 4425-4431
作者:CANTOS, ALBERT、MARCH, PEDRO DE、MORENO-MANAS, MARCIAL、PLA, ANNA、SANCHEZ-FE+
DOI:——
日期:——
Synthesis of Pyrano[4,3-<i>c</i>]pyrazol-4(1<i>H</i>)-ones and -4(2<i>H</i>)-ones from Dehydroacetic Acid. Homo- and Heteronuclear Selective NOE Measurements for Unambiguous Structure Assignment
作者:Albert Cantos、Pedro de March、Marcial Moreno-Mañas、Anna Pla、Francisco Sanchez-Ferrando、Albert Virgili
DOI:10.1246/bcsj.60.4425
日期:1987.12
Cyclization of dehydroacetic acid N-substituted hydrazones furnished 1-substituted 3,6-dimethylpyrano[4,3-c]pyrazol-4(1H)-ones, together with varying amounts of N,N′-disubstituted 5-hydroxy-3-methyl-4-(3-methyl-1H-pyrazol-5-yl)-1H-pyrazoles. The same pyranopyrazolones were obtained regioselectively without side reactions from N-alkylhydrazines and 4-chloro-3-(1-chlorovinyl)-6-methyl-2H-pyran-2-one