Unexpected [2 + 2] cycloaddition between the PO group of P-(2,4,6-triisopropylphenyl) P-heterocycles and dimethyl acetylenedicarboxylate
Chemical Communications1999Iss. 15, pp. 1423–1424
Abstract
The reaction of 1-(2,4,6-triisopropylphenyl)-1,2-dihydrophosphinine 1-oxide 1d with dimethyl acetylenedicarboxylate (DMAD) affords, surprisingly, oxaphosphetene 3 instead of the expected Diels–Alder cycloadduct; the unusual reactivity of the trialkylphenylphosphine oxides towards DMAD seems to be of general value.
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