the enone 7 which was converted to anatoxin-a 1 by mild acidolysis. Maintenance of chiral homogeneity from both (+)- and (-)- 2 was demonstrated by diastereomeric amide formation from (+)- and (-)-1. However, the prior correlation of(+)- 2 with (+)-1 was found to be incorrect: in fact (-)- 2 gives (+)-1.
通过与
2-氯丙腈的连续碱催化缩合和N-脱烷基化作用,双环酮2(任一对映异构体)均以高收率转化为
缩水甘油腈4 。打开
环氧化物,然后从所得的α-
氯酮中除去HCl,得到烯酮7,该烯酮通过温和的酸解作用转化为抗毒素-a 1。由(+)-和(-)-1形成非对映异构酰胺证明了从(+)-和(-)-2两者均保持手性均一性。但是,发现(+)-2与(+)-1的先验相关性是不正确的:实际上(-)-2给出了(+)-1。