Abstract
Despite the growing interest in iminophosphonamines R2 P(NHR′)(NR′), nonsymmetric examples bearing different N,N′-substituents are quite rare and have been prepared exclusively by the Staudinger reaction. We report here the synthesis of a series of new iminophosphonamines Ph2 P(NHR)(NR′) (R = Me, t -Bu, o -Tol; R′ = p -Tol, o -Tol, 2,6-Xyl, 2,6-Diip, p -Ts) showing that the Kirsanov condensation is a viable and simpler approach, although with some limitations. This method allows the synthesis to be accomplished in a one-pot manner via stepwise double amination of a trihalophosphorane and permits the introduction of at least one sterically bulky N-substituent. The second amination step is shown to be highly sensitive to: (a) the steric bulk of the amine, and (b) the acidity of the aminohalophosphonium intermediate.
Key words Kirsanov condensation - nonsymmetric iminophosphonamines - steric effects - aminohalophosphonium
