作者:Thomas Kienzler、Peter Strazewski、Christoph Tamm
DOI:10.1002/hlca.19920750411
日期:1992.6.24
Coprine (1), a toxine of the mushroom Coprinus atramentarius, was synthesized starting from the 2-amino and 1-carboxy-protected L-glutamic acids 4 and 12. Compound 4 was first decarboxylated by a radical chain reaction to bromide 5 which underwent ring closure to cyclopropanecarboxylate 6 on treatment with NaH (Scheme 1). Subsequent oxidative electrolysis of 7 to form tert-butyl N-(1-ethoxycyclopropyl)carbamate
蘑菇Coprinus atramentarius的毒素,Coprine(1)是从2-氨基和1-羧基保护的L-谷氨酸4和12开始合成的。首先通过自由基链反应将化合物4脱羧成溴化物5,然后在用NaH处理时将其闭环成环丙烷羧酸酯6(方案1)。随后氧化7生成N-(1-乙氧基环丙基)氨基甲酸叔丁酯(8)并进行酸性水解,生成1-氨基环丙醇盐酸盐(9)。选择性切割8(10或11)个氨基保护基,将相应的胺13与L-谷氨酸12偶联,酸水解生成的L-谷氨酰胺衍生物17,得到O-乙基coprine(3)和coprine(1)。