2-Phenyl-4-bis(methylthio)methyleneoxazol-5-one: versatile template for diversity oriented synthesis of heterocycles
作者:Vijayalaxmi Amareshwar、Nimesh C. Mishra、Hiriyakkanavar Ila
DOI:10.1039/c1ob05495c
日期:——
for the synthesis of novel heterocyclic scaffolds. The key protocol involves nucleophilic ring opening of 1 with various primary aliphatic, aromatic amines and diamines to give open-chain amide adducts which are transformed into 4-bis(methylthio)methylene-2-phenyl-1-alkyl/arylimidazol-5-(4H)-ones (5) in good yields in the presence of anhydrous NaOAc/AcOH. Similarly, the amide adducts 4h–i from 3,4-d
4-双(甲硫基)亚甲基-2-苯基恶唑-5-酮(1)已被证明是用于合成新型杂环支架的通用模板。关键方案涉及与各种伯脂族,芳族胺和二胺进行1的亲核开环,以生成开链酰胺加合物,将其转化为4-双(甲硫基)亚甲基-2-苯基-1-烷基/芳基咪唑-5-(在无水NaOAc / AcOH存在下,高收率的4 H)-一(5)。同样,酰胺加成物4h–i来自3,4-二甲氧基苯基乙胺 和 色胺在POCl 3的存在下进行有趣的重排以提供1-(2-苯基-5-甲硫基-4-噻唑基)二氢异喹啉 和 β-咔啉衍生品8–9的收益率很高。来自的酰胺加合物14邻苯二胺 暴露于回流 醋酸或在存在Ag 2 CO 3的情况下提供取代基3 H -1,5-苯并二氮杂酮, 2-(5-甲硫基-2-苯基-4-恶唑基)-1 H-苯并咪唑 和三取代 恶唑(15–17),而乙二胺产生乙烯桥式束缚双咪唑23和双恶唑 在相似的反应条件下为24。已经提出了可能形成各种产物的机制。