ABSTRACT
Stirring an equimolar mixture of ninhydrin 1 and 2-aminochromen-4-ones 2 in CH3COOH at room temperature produced 6a,11a-dihydroxy-6H-chromeno[2,3-b]indeno[2,1-d]pyrrole-11,12(6aH,11aH)-diones 3, which on heating with aromatic amines 6 in acetic acid produced 11b-hydroxy-7-N-arylimino-6H-chromeno[2,3-b]isoindolo[1,2-e]pyrrole-12,13(11bH)-diones 7.
GRAPHICAL ABSTRACT
![](/cms/asset/eb80a88e-64b0-4478-9be8-4f1654c51500/lsyc_a_1170147_uf0001_oc.jpg)
Acknowledgments
We gratefully acknowledge the Department of Science and Technology–Funding for Infrastructure in Science and Technology for instrumental help at RKMVC College; University of Kalyani and IICB, Jadavpur for spectral analysis; and finally the college authority for providing other research facilities.