One-Pot Three-Component Heteroannulation of β-Oxo Dithioesters, Amines and Hydroxylamine: Regioselective, Facile and Straightforward Entry to 5-Substituted 3-Aminoisoxazoles
作者:Subhasis Samai、Tanmoy Chanda、Hiriyakkanavar Ila、Maya Shankar Singh
DOI:10.1002/ejoc.201300038
日期:2013.7
amine, which undergoes nucleophilic attack by hydroxylamine followed by intramolecular cyclization with the oxo functionality and subsequent dehydration to give 5-substituted 3-aminoisoxazoles as a single regioisomer in good yields. Furthermore, the mechanism of the reaction has been established experimentally and shown to be in agreement with the hard and soft (Lewis) acid and base (HSAB) theory.
通过 β-氧代二硫酯、胺和羟胺在乙醇中的环缩合反应,实现了以前难以获得且合成要求高的 3-(环烷基/烷基/芳基氨基)-5-芳基/烷基异恶唑的高效且高度区域选择性的一锅三组分合成在回流。这种转化是通过 β-氧代二硫酯和胺的反应原位生成的 β-氧代硫酰胺进行的,它经过羟胺的亲核攻击,然后与氧代官能团发生分子内环化,然后脱水得到 5-取代的 3-氨基异恶唑作为单一区域异构体,产率良好。此外,该反应的机理已通过实验建立,并表明与硬和软(刘易斯)酸碱(HSAB)理论一致。