A Concise Microwave-Assisted Synthesis of 2-Aminoimidazole Marine Sponge Alkaloids of the Isonaamines Series
作者:E. Babaev、E. Van der Eycken、D. Ermolat’ev、V. Alifanov、V. Rybakov
DOI:10.1055/s-2008-1078444
日期:——
A short and efficient route to 1,4-substituted 2-aminoimidazole alkaloids starting from the easily accessible 2-alkylaminopyrimidines and α-bromo aldehydes is reported. The formation of the intermediate imidazo[1,2-a]pyrimidinium salts and subsequent cleavage were facilitated by microwave irradiation. Marine sponge alkaloids preclathridines A, C and isonaamines A, C, D were obtained in high yields using the optimized one-pot two-step procedure.
本研究报道了从容易获得的 2-烷基氨基嘧啶和δ-溴醛出发,制备 1,4 代 2-氨基咪唑生物碱的简短而有效的路线。微波辐照促进了中间体咪唑并[1,2-a]嘧啶盐的形成和随后的裂解。利用优化的一锅两步法,高产率地获得了海洋海绵生物碱 preclathridines A、C 和异纳胺 A、C、D。