Expeditious, Metal-Free, Domino, Regioselective Synthesis of Highly Substituted 2-Carbonyl- and 2-Phosphorylfurans by Formal [3+2] Cycloaddition
作者:Wilfried Raimondi、Daniel Dauzonne、Thierry Constantieux、Damien Bonne、Jean Rodriguez
DOI:10.1002/ejoc.201201192
日期:2012.11
the dual electrophilic properties of (2-chloro-2-nitroethenyl)benzenes in a one-pot, formal [3+2] cycloaddition. Using a base (DBU), the desired trisubstituted heterocycles were formed rapidly (10–30 min) in good to excellent yields (51–92 %), and this versatile, metal-free methodology was applied to the synthesis of 2-acyl- and 2-carboalkoxyfurans and furan-2-carboxamides. Additionally, by using 2-ketophosphonate
通过利用 1,2-二羰基的双重亲核特性和(2-氯-2-硝基乙烯基)苯的双重亲电特性,在一锅正式 [3+2] 环加成反应中,可以很容易地合成 2-官能化呋喃。使用碱 (DBU),所需的三取代杂环以良好到极好的产率 (51–92%) 快速(10–30 分钟)形成,这种多功能、无金属的方法用于合成 2-酰基-和 2-carboalkoxyfurans 和 furan-2-carboxamides。此外,通过使用 2-酮膦酸酯衍生物作为双亲核试剂,相应的 2-磷酰呋喃以良好的产率 (53–74%) 形成。