New derivatives of an intriguing marine natural product are now accessible. The first asymmetric synthesis of the simple tetrodotoxin analogue, 5,11-dideoxytetrodotoxin (3), was achieved. Hydroxylation at position C8 of the key intermediate 1 relied on the neighboring trichloroacetamide group, and stereoselective elaboration of the vinyl group gave alpha-hydroxylactone 2, which was transformed into
令人着迷的海洋
天然产物的新衍
生物现已上市。实现了简单的
河豚毒素类似物5,11-二脱氧
河豚毒素(3)的首次不对称合成。关键中间体1的C8位上的羟基化依赖于相邻的三
氯乙酰胺基,
乙烯基的立体选择性修饰得到α-羟基内酯2,其通过新的
胍基化方法转化为标题化合物。