Synthesis of Fused Heterocyclic Compounds Derived from 2-Phenyl[1,5] benzothiazepin-4(5H)-One

2-PHENYL[1,5] benzothiazepin-4(5H)-one (1) was reacted with arylidenenitriles, a mixture of carbon disulphide or phenylisothiocyanate and active nitriles to give pyrano-, pyrido-, thiopyrano-, 1,2dithiolo[ 3,4-e]-; 1,3-dithiolo[4,5-e] [1,5] benzothiazepines, benzothiazepino-[ 6,5-c] [1,8] naphthyridine and oxathieno [1, 5] benzothiazepines (2-11), respectively. Treatment of compound 1 with a mixture of sulphur and phenyl isothiocyanate or 2-amino-1,1,3-tricyano-2aminopropene gave 1,3-dithieno [4,5-e]-and thieno [3,2-e]-[1,5] benzothiazepines (12, 13), respectively.