Phosphine-catalysed (4+1) annulations of β′-acetoxy allenoate with β,γ-unsaturated carbonyl compounds
作者:Yueqi Zhang、Danfeng Wang、Xiaofeng Tong
DOI:10.1039/d1cc00368b
日期:——
While β,γ-unsaturated carbonyl compounds have been widely used as γC- or αC-nucleophiles, their potential αC,αC-bisnucleophilic reactivity is still underdeveloped. Herein, a phosphine-catalysed (4+1) annulation of β′-acetoxy allenoate and a β,γ-unsaturated carbonyl compound is reported, wherein β′-acetoxy allenoate is the 1,4-biselectrophilic component while the β,γ-unsaturated carbonyl compound serves
尽管β,γ-不饱和羰基化合物已被广泛用作γC-或αC-亲核试剂,但它们潜在的αC,αC-双亲核反应活性仍未得到开发。在本文中,报道了膦催化的β'-乙酰氧基脲酸酯和β,γ-不饱和羰基化合物的(4 + 1)环化反应,其中β'-乙酰氧基脲酸酯是1,4-双亲电子组分,而β,γ-不饱和羰基化合物用作αC,αC-双亲核试剂。该方法不仅在温和的条件下提供了一种新的β,γ-不饱和羰基化合物的反应方式,而且拓宽了路易斯碱催化的乙酰氧基脲酸酯环化反应的范围。