Abstract

Abstract Phosphenium ion 1 underwent cheletropic cycloaddition with E-1-benzylbutadiene 2b to afford cyclic phosphonium salts 3b and 4b. In situ hydrolysis of the phosphonium salts produced phosphinamides 6a and 6b in a 3:1 ratio. Three chemical steps coverted phosphinamide 6a to the title compound 12b.

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