1: With Amberlyst(R) 15 in dichloromethane T=20°C; 2: With ammonium hydroxide in methanol T=20°C; 1.5 h;

1: With tri-tert-butyl phosphine; palladium diacetate; sodium t-butanolate in xylene T=50°C; 2: With macroporous polymer-supported isocyanate in xylene T=50°C; 24 h;