Reactions of 16-Nitroindolenines of the Vincadifformine Type
摘要:
The reactivity of 16-nitroindolenine (4), a byproduct of the aromatic nitration of vincadifformine (1), has been studied. In TFA 4 yielded 10-nitrovincadifformine (3) whereas acid hydrolytic treatment led to the tetracyclic oxindole structure (8) by cleavage of the 2-16 bond. Reduction of 4 (SnCl2 or hydrogenolysis) allowed recovery of 1 in good yield.
Reduction and N-Alkylation of α-Methylene-indolines with Sodium Cyanoborohydride in Carboxylic Acids
作者:Emilia R. Balogh、Bela Zsadon、Antal Csámpai、R. Pál
DOI:10.1080/00397919408012649
日期:1994.3
Abstract The reaction of α-methylene-indolines with NaCNBH3 in carboxylic acids at room temperature can yield either 2β,3β-dihydro-indolines or their N-alkyl derivatives as main products with high selectivity, depending mainly on the carboxylic acid and on the reaction time when using a large excess of NaCNBH3.
The reactivity of 16-nitroindolenine (4), a byproduct of the aromatic nitration of vincadifformine (1), has been studied. In TFA 4 yielded 10-nitrovincadifformine (3) whereas acid hydrolytic treatment led to the tetracyclic oxindole structure (8) by cleavage of the 2-16 bond. Reduction of 4 (SnCl2 or hydrogenolysis) allowed recovery of 1 in good yield.