Concise Synthesis of the Isothiourea Organocatalysts Homobenzotetramisole and Derivatives
作者:Beatrice Ranieri、Omar Robles、Daniel Romo
DOI:10.1021/jo400603n
日期:2013.6.21
A concise approach to the synthesis of homobenzotetramisole and derivatives is described. Our strategy features a one-pot acylation–cyclization of 2-aminobenzothiazole with α,β-unsaturated acid chlorides to afford annulated pyrimidones. Subsequent Grignard addition followed by acid-promoted dehydration and reduction provides good overall yields of the title compounds in three steps and in quantities
描述了合成高苯并四咪唑及其衍生物的简明方法。我们的策略的特点是将一锅法酰化-将2-氨基苯并噻唑与α,β-不饱和酰氯进行环化反应,以提供环化的嘧啶酮。随后加入格氏试剂,然后进行酸促进的脱水和还原反应,分三步进行,以最高10 g的量提供了良好的标题化合物总收率。该合成使用低成本且容易获得的起始原料,并且在手性分离后能够接触这些越来越有用的亲核催化剂的两个光学对映体。