A method is provided for the synthesis of the previously unknown spiro heterocyclic ketene aminals, 3,9-bis(substituted-methylene)-2,4,8, 10-tetraazaspiro[5.5]undecane 3 in moderate to excellent yields by cyclocondensation reaction of ketene dithioacetals 1 with tetrakis(aminomethyl)methane 2.
A method is provided for the synthesis of the previously unknown spiro heterocyclic ketene aminals, 3,9-bis(substituted-methylene)-2,4,8, 10-tetraazaspiro[5.5]undecane 3 in moderate to excellent yields by cyclocondensation reaction of ketene dithioacetals 1 with tetrakis(aminomethyl)methane 2.