SYNTHESIS AND CYCLIZATION OF 3-[3′(2′-SPIROTHIAZOLIDIN-4′-ONYL)] QUINAZOLIN-4-ONE DERIVATIVES
作者:Maher F. El-zohry、Abdullah A. Al-ahmadi、Fatimah A. Aquily
DOI:10.1080/10426500108040252
日期:2001.8
The reaction of 3-(3H)-aminoquinazolin-4-one derivatives 4a-c with 2-spiro-1,3-oxathio-lan-5-one derivatives 7a-f in ethanol yielded 3-[3'(2'-spirothiazolidin-4'-one)]quinazolin-4-one derivatives 8a-r in excellent yield. Cyclization of compounds 8a-r with sodium hydroxide in ethanol or with fusion with anhydrous sodium acetate gave the spirothiazol-opyrazoloquinazolinone derivatives 9a-r. All the synthesized spiro heterocyclic derivatives were identified by conventional methods (IR. H-1 NMR) and elemental analyses.