to the amine (24) through reductive amination of the aldehyde (10). Oxidative cleavage of the olefin (25) gave the corresponding diacid (26), whose functional groups were appropriately differentiated by formation of the peptide (29). Cyclisation of the β-amino acid (30) and subsequent hydrogenolysis of the resulting spiro β-lactam (31) gave tabtoxin.
                                    Tabtoxin(1)中,从外毒素Pseudmonas粉虱(
生物体负责烟草植物的野火病),已经由立体有择的合成路线合成。酰基亚
硝基化合物向环
己二烯的环加成反应选择性地产生双环酯(6),该双环酯通过醛(10)的还原胺化转化为胺(24)。烯烃(25)的氧化裂解得到相应的二酸(26),其官能团可通过形成肽(29)进行适当区分。β-
氨基酸(30)的环化和随后的螺-β-内酰胺(31)的氢解产生了毒素。