Synthesis of a Class of Fused δ-Sultone Heterocycles<i>via</i>DBU-Catalyzed Direct Annulative SuFEx Click of Ethenesulfonyl Fluorides and Pyrazolones or 1,3-Dicarbonyl Compounds
作者:Xing Chen、Gao-Feng Zha、Grant A. L. Bare、Jing Leng、Shi-Meng Wang、Hua-Li Qin
DOI:10.1002/adsc.201700887
日期:2017.9.18
(E)‐2‐(hetero)arylethenesulfonyl fluorides and (E,E)‐1,3‐dienylsulfonyl fluorides are bis‐electrophiles and rare members of the sulfonyl fluoride family with limited information being known of their reactivity and synthetic utility. The direct annulation reaction of these 2‐substituted ethenesulfonyl fluorides with medicinally important enolizable pyrazolones and 1,3‐dicarbonyl compounds utilizing catalytic DBU
(E)-2-(杂)芳烷基磺酰氟和(E,E)-1,3-二烯基磺酰氟是双亲电子试剂,是磺酰氟家族的稀有成员,其反应性和合成用途知之甚少。在温和条件下,利用催化DBU在甲醇中,将这些2-取代的乙磺酰氟与具有重要医学意义的可烯丙基吡唑酮和1,3-二羰基化合物进行直接环化反应,会产生50多个结构不同的δ-磺内酯杂环,带有吡唑啉酮环或环烯酮分别以良好到极好的产量。1,3-二烯基磺酰氟中与磺酰氟基团相邻的1位双键是化学反应的选择性位点,但其反应性不如芳硫磺酰氟的双键。这些稠合杂环的高周转率和结构坚固性,