Abstract
A silver-mediated domino radical addition/cyclization reaction of diarylphosphine oxides with propynoic acid derivatives is described in this article. The reaction of diarylphosphine oxides with alkynoates or propynoic amide was regioselective, producing 3-phosphorylated coumarins and benzophosphole oxides in moderate to good isolated yield, respectively. The hydrogen bond between P[double bond, length as m-dash]O and N-H was proposed to assist the vinyl radical regioselective arylation process. The reaction conditions were also compatible with the conversion of dialkylphosphine oxides to 3-phosphorylated-coumarins and quinolin-2(1H)-one in good yields.
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