CONDENSED HETEROCYCLES CONTAINING BRIDGEHEAD NITROGEN .2. REACTION OFTETRAHYDRO-7-BENZYLIDENE-4-PHENYLPYRIMIDINO[5,6-A] CYLOPENTENE-2-THIONE WITH BIFUNCTIONAL COMPOUNDS

,2,3,4-Tetrahydro-7-benzylidene-4-phenylpyrimidino [5, 6-a] cyclopente ne-2-thione (II), obtained by the condensation of 2,5-dibenzylidenecyc lopentanone and thiourea was subjected to reaction with chloroacetic a cid, alpha-bromo propionic acid, phenacyl bromide and 1,2-dibromoethan e to furnish enyl-8-benzylidenethiazolo[2,3-b]pyrimidino[5,6-a] cyclop entene-3(2H)-one (III), yl-8-benzylidene-2-methylthiazolo[2,3-b]pyrimi dino [5,6-a] cyclopentene-3(2H)-one (IV), 3,5-diphenyl-5H-8-benzyliden ethiazolo[2, 3-b]pyrimidino[5,6-a] cyclopentene (V). and 5H-5-phenyl-8 -benzylidenethiazolo[2,3-b]pyrimidino [5,6-a] cyclopentane (VI) respec tively. The thiazolidinone (III) was further condensed with benzaldehy de to form the corresponding dibenzylidene derivative (VII). The struc tures of the compounds were ascertained from their elemental analysis, IR and PMR spectral data.