Sn. Bajpai et al., A NOVEL SYNTHESIS OF PIRO[5H-1,4-DIAZEPINE-5,3'-[3H]INDOL]-2'(1'H)-ONES AND 2H-1,5-BENZODIAZEPINE-2,3'-[3H]INDOL]-2'(1'H)-ONES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 36(11), 1997, pp. 1005-1008
Reactions of 3-aroylmethyleneindol-2(H)-ones 4 with ethylenediamine an
d o-phenylenediamine have been investigated for the; first time leadin
g to novel system of spiro compounds 5 and 8 respectively. Schiffs bas
es 6 and 9 have also been isolated and properly characterized.