Regioselective synthesis of spiro isoxazole‐oxindole‐tetrahydrothiophene hybrids
<i>via</i>
cascade reactions under catalyst‐free conditions
作者:Sakkani Nagaraju、Kota Sathish、Neeli Satyanarayana、Banoth Paplal、Dhurke Kashinath
DOI:10.1002/jhet.3803
日期:2020.1
Catalyst‐free synthesis of the isoxazole‐spirooxindole‐tetrahydrothiophene hybrids is reported. Formation of 1,4‐thia‐Michael and intramolecular aldol reactions were observed (instead of 1,6‐thia‐Michael followed by vinylogous Henry reactions) in a regioselective fashion to give new isoxazole‐spirooxindole‐tetrahydrothiophene hybrids with excellent yields.
据报道,无催化剂合成了
异恶唑-螺氧并
恶唑-
四氢噻吩杂化物。以区域选择性的方式观察到了1,4-
噻吩-迈克尔和分子内羟醛反应的形成(而不是1,6-
噻吩-迈克尔接着是
乙烯基亨利反应),从而以优异的产率得到了新的
异恶唑-螺氧并
恶唑-
四氢噻吩杂种。