The addition of trimethylsilyloxy phosphorus (III) derivatives generated in situ to imines at room temperature provides a mild selective and high yielding route to α- aminoalkylphosphorate and α-aminoalkylphenylphosphinate esters. Isocyanates and carbodiimides react similarly to give phosphonoureas and phosphonoguarnidines respectively aldehydes and ketones are much less reactive and cyanides are inert.