Several clavulone derivatives were synthesized from clavulone I (1) and clavulone II (2). The carboxylic acid 3 and 4-O-deacetyl derivative 4 were synthesized by selective enzymatic hydrolysis of 2 using porcine liver esterase and orange peel acetylesterase, respectively. From the carboxylic acid 3, the benzyl ester 5, tert-butyl ester 6 and amide 7 were prepared. The 12-O-deacetyl derivative 9 was synthesized by organicuprate reduction of the epoxide 8 which was prepared from 2. The derivatives 13-15, which possess an elongated α-side chain, were synthesized from 1 via the hemiacetal 12.
几种克拉维酮衍
生物是由克拉维酮I(1)和克拉维酮II(2)合成的。
羧酸3和4-O-去乙酰衍
生物4是通过选择性酶
水解2合成的,分别使用了猪肝
酯酶和橙皮乙酰
酯酶。从
羧酸3制备了苄基酯5、叔丁基酯6和酰胺7。通过有机还原反应,从2合成了
环氧化物8,再由其得到12-O-去乙酰衍
生物9。衍
生物13-15具有延长的α-侧链,是通过半醛12从1合成的。