Synthesis of Spirolactones and Functionalized Benzofurans via Addition of 3-Sulfonylphthalides to 2-Formylaryl Triflates and Conversion to Benzofuroisocoumarins
作者:Deepa Nair、Pallabita Basu、Soumyaranjan Pati、Kajal Baseshankar、Chenikkayala Siva Sankara、Irishi N. N. Namboothiri
DOI:10.1021/acs.joc.2c03097
日期:——
modified Hauser–Kraus reaction of 3-sulfonylphthalide with 2-formylaryl triflates is reported here. The initial reaction involved 1,2-addition of phthalide to the formyl group and intramolecular cyclization via substitution of triflate followed by a cascade of rearrangements leading to spirolactone or benzofuran derivatives. The electronic nature of substituents on aryl triflates affected the course
本文报道了一种通过 3-磺酰苯酞与 2-甲酰芳基三氟甲磺酸酯的改良 Hauser-Kraus 反应合成螺苯并呋喃-异苯并呋喃和取代苯并呋喃的便捷方案。最初的反应涉及苯酞与甲酰基的 1,2-加成和通过取代三氟甲磺酸酯进行分子内环化,随后进行级联重排,生成螺内酯或苯并呋喃衍生物。芳基三氟甲磺酸酯上取代基的电子性质影响了反应的过程和结果。该机制得到了通过质谱法成功表征其中一种中间体的支持。一种药用相关的 B 型流感病毒抑制剂苯并呋喃异香豆素是从螺环化合物一步合成的,从而证明了我们方法的合成效用。