followed by bromine–iodine exchange and Pd–Cu co-catalyzed Stille cross-coupling of the resulting alkenyl iodide with methyl (Z)-2-tributylstannyl-3-methoxyacrylate (7). The synthetic strobilurins G, M, and N were identical with the corresponding natural compounds. In addition, the (2′ S)-configuration of strobilurin G (1) was unambiguously established by oxidative degradation of the synthetic intermediate
strobilurins的一般合成中的关键反应是(E)-
肉桂醛与衍生自
溴化(1,1-二
溴乙基)三苯基phosph的
磷化钾8的高(Z)选择性Wittig反应,然后进行
溴-
碘交换和Pd-Cu共同催化所得烯基
碘化物与(Z)-2-三
丁基锡烷基-
3-甲氧基丙烯酸甲酯的Stille交叉偶联(7)。合成的球果伞星蛋白G,M和N与相应的天然化合物相同。此外,通过合成中间体(S)-的氧化降解明确确定了嗜球果伞素G(1)的(2 'S)-构型。9至(R)-2,3-二羟基
异戊酸。