1: N3-benzyl-2-thioxo-2,3-dihydroquinazolin-4(1H)-one With P-BEMP in dimethyl sulfoxide; N,N-dimethyl-formamide T=25°C; 16 h; 2: n-bromopentane in acetonitrile T=20°C; 16 h;

1.1: dimethylsulfoxide / 72 h / 100 °C 2.1: P-BEMP / dimethylsulfoxide; dimethylformamide / 16 h / 25 °C 2.2: acetonitrile / 16 h / 20 °C View Scheme

1.1: dimethylsulfoxide / 72 h / 100 °C 2.1: P-BEMP / dimethylsulfoxide; dimethylformamide / 16 h / 25 °C 2.2: acetonitrile / 16 h / 20 °C View Scheme