1: 1-amino diphenylmethane; bromoacetal LCC-Dynosphere polystyrene resin in 1-methyl-pyrrolidin-2-one; dimethyl sulfoxide T=80°C; 2: ethyl-isocyanate in 1-methyl-pyrrolidin-2-one T=70°C; 3: With trifluoroacetic acid 16 h;

1: 1-amino diphenylmethane; bromoacetal LCC-Dynosphere polystyrene resin in 1-methyl-pyrrolidin-2-one; dimethyl sulfoxide T=80°C; 2: Imidazole-1-carboxylic acid ethylamide in 1-methyl-pyrrolidin-2-one T=70°C; 3: With trifluoroacetic acid 16 h;