Novel two-step solution phase protocols for the synthesis of dihydroquinazolines and fused dihydroquinazoline-benzodiazepine tetracycles are reported. The methodology employs the Ugi reaction to assemble the desired diversity and acid treatment enables ring-closing transformations. The protocols are further facilitated by the use of microwave irradiation and n-butyl isocyanide to control the rate of
报道了用于合成二氢喹唑啉和稠合二氢喹唑啉-苯二氮卓四环的新型两步液相方案。该方法使用 Ugi 反应来组装所需的多样性,酸处理可实现闭环转化。通过使用微波辐射和正丁基异氰化物来控制每个成环转化的速率,进一步促进了该协议。