Cycloaddition/Aromatization Sequence for the Synthesis of 2,3-Disubstituted Benzenephosphonates
作者:Jacqueline Marchand-Brynaert、Elise Villemin
DOI:10.1055/s-0031-1289757
日期:2012.6
function. The [4+2] cycloaddition of diethyl 1-phosphonobuta-1,3-diene with tetracyanoethylene, (E)-1,4-diphenylbut-2-ene-1,4-dione, N-phenylmaleimide, and dialkyl acetylenedicarboxylates is described. For the last two cases, treatment of the cycloadducts with nitrobenzene and a palladium catalyst allows the aromatization. Selective deprotections lead to phthalimide/phthalate derivatives with an ortho-phosphonic