2-phenylpyrano2,3-bpyridine compounds and process for their preparation

Abstract From the Canadian patent

A compound of the formula (I): (I), wherein R, R' and R" are each hydrogen or lower alkyl of 1 to 4 carbon atoms; X is hydrogen, chloro bromo, alkyl-, thio, alkylsulfinyl, alkylsulfonyl hydroxy, alkoxy, ben-, zoyl, acetyl or alkyl; Y is hydrogen halo, di- or tri-, chloro, alkyl, alkoxy methylenedioxy, or phenoxy; the, dotted line indicates the optional presence of a double bond at the 2,3- or 3,4-positions; with the proviso that when the dotted line represents a double bond at the 2,3position then the R group is not present and with the, further proviso that when the dotted line indicates the presence of a double bond, then X and Y can not both be hydrogen, is useful as an antiviral agent …