REACTION OF N-1,N-2-DIARYLAMIDINES WITH DICYANOMETHYLENE COMPOUNDS

ioxo-2,3-dihydro-1H-inden-2-ylidene)ethanenitriles 6a-c together with the corresponding formanilides 7a-c have been obtained from the reacti on of N-1,N-2-diarylformamidines 1a-c with xo-2,3-dihydro-1H-inden-2-y lidene)propanedinitrile 2 in ethyl acetate solution, while the analogo us N-1,N-2-diarylacetamidines 8b-e with 2 gave indeno[1,2-d]azepines 1 7b-e and in two cases ioxo-2,3-dihydro-1H-inden-2-ylidene)ethanenitril es 6b,c as minor products. In contrast, (1',2',3',4'-tetrahydropyridin e)]-5'-carbonitriles 22b,c were obtained from the reaction of 8b,c wit h xo-2,3-dihydro-1H-indol-2-ylidene)propanedinitrile 18. The structure assignment of spiro compound 22b has been confirmed on the basis of a n X-ray crystal structure determination.