Inverse Wittig reaction of oxaphosphetenes formed by the [2+2] cycloaddition of arylphosphine oxides and dimethyl acetylenedicarboxylate (DMAD)
作者:Keglevich、Forintos、Koertvelyesi、Toke
DOI:10.1039/b108675h
日期:2002.12.17
The intermediate oxaphosphetenes 2 formed by the novel cycloaddition of the PO group of arylphosphine oxides 1 and the acetylene moiety of DMAD are stabilised by an inverse Wittig reaction to afford the corresponding stabilised phosphonium ylide 3.
芳基膦氧化物 1 的 PO 基团与 DMAD 的乙炔基团通过新型环加成反应形成的中间肟 2 通过逆维蒂希反应得到稳定,从而得到相应的稳定膦酰亚胺 3。
New evidence on the structure of the product from the reaction of cyclic 2,4,6-trialkylphenylphosphine oxides with dimethyl acetylenedicarboxylate (DMAD); formed by an inverse Wittig reaction type protocol
New evidence based on spectroscopy, quantum chemical calculations and reactivity suggest that the spirocyclic oxaphosphetes (5) formed by the [2+2] cycloaddition of the title P-heterocycles (4) and DMAD are intermediates to afford a stabilised phosphonium ylide (6) existing as two conformers (6A and B).