Synthesis of Spiro- and Fused Heterocycles via (4+4) Annulation of Sulfonylphthalide with<i>o</i>-Hydroxystyrenyl Derivatives
作者:Alati Suresh、Thekke V. Baiju、Tarun Kumar、Irishi N. N. Namboothiri
DOI:10.1021/acs.joc.8b03039
日期:2019.3.15
expedient one-pot protocol for the synthesis of functionalized benzofuran containing fused and spiro-heterocycles has been accomplished by the modified Hauser–Kraus (HK) annulation of sulfonylphthalide with o-hydroxychalcones and o-hydroxynitrostyrylisoxazoles. The multicascade process involves Michaeladdition, Dieckmann cyclization, and a series of cyclizations, eliminations, and rearrangements to deliver
Synthesis of
<scp>4</scp>
<i>H</i>
‐chromene‐isoxazole hybrids via
<i>ortho</i>
‐hydroxy directing cyclization of isoxazole‐styrenes and Michael addition of imino‐chromenes in aqueous medium
作者:Sakkani Nagaraju、Kota Sathish、Dhurke Kashinath
DOI:10.1002/jhet.4251
日期:2021.6
AbstractA green, efficient, and one‐pot method synthesis of functionalized 4H‐chromene‐isoxazole hybrids is reported via o‐hydroxy group directing cyclization of isoxazole‐styrenes and Michael addition of 3,5‐dimethyl‐4‐nitroisoxazole on 2‐imino‐2H‐chromene‐3‐carbonitrile (independent methods). The developed methodology was further extended for nitromethane, malononitrile, and alkylcyanoacetates as Michael donors.
Venkateshwarlu, V.; Rao, C. Janakiram; Krishnamurthy, A., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1987, vol. 26, # 1-12, p. 728 - 730
作者:Venkateshwarlu, V.、Rao, C. Janakiram、Krishnamurthy, A.