作者:Masaaki Miyashita、Toshiaki Kumazawa、Akira Yoshikoshi
DOI:10.1246/cl.1981.593
日期:1981.5.5
Curzerenone and epicurzerenone were synthesized by means of a combination of γ-ketoester synthesis and 3-methylfuran annulation both of which utilize nitroolefins as synthons. Starting material, methyl 2-methyl-4-oxo-2-vinylpentanoate, was prepared by the Lewis acid-promoted reaction of l-methoxy-2-methyl-l-[(trimethylsily)oxy]-1,3-butadiene and 2-nitropropene, while key intermediate 3,6-dimethyl-6-vinyl-6
通过γ-酮酯合成和3-甲基呋喃环化相结合的方法合成了 Curzerenone 和 Epicurzerenone,两者都利用硝基烯烃作为合成子。起始原料 2-甲基-4-氧代-2-乙烯基戊酸甲酯是通过路易斯酸促进的 l-甲氧基-2-甲基-1-[(三甲基甲硅烷基)氧基]-1,3-丁二烯和 2 -硝基丙烯,而关键中间体 3,6-二甲基-6-乙烯基-6,7-二氢苯并呋喃-4(5H)-one 是通过 5-甲基-5-乙烯基环己烷-1,3-二酮的 KF 催化反应组装的和1-硝基-1-苯基硫代丙烯。