3-dialky; quinazoline-2,4-diones 9 has been synthesized on polymeric support by a three step approach. Addition of isocyanates or amines to a polymer-supported anthranilate derivative affords urea 6 which can be cyclized to 3-alkyl quinazolinedione 7. N-Alkylation at the 1-position and cleavage from the resin affords 9a-o in high yield and purity.
1,3-dialky库;
喹唑啉-2,4-二酮9已通过三步法在聚合物载体上合成。将
异氰酸酯或胺加到聚合物负载的
邻氨基苯甲酸酯衍
生物上,可制得
尿素6,其可环化成3-烷基
喹唑啉二酮7。在1-位的N-烷基化和从
树脂上裂解得到的9a-o具有高产率和纯度。