Synthesis and Structural Characterization of Stable Organogold(I) Compounds. Evidence for the Mechanism of Gold-Catalyzed Cyclizations
作者:Le-Ping Liu、Bo Xu、Mark S. Mashuta、Gerald B. Hammond
DOI:10.1021/ja806685j
日期:2008.12.31
nucleophile attacks a gold-activated carbon-carbon multiple bond to give an alkenyl Au intermediate, notwithstanding the fact that these intermediates are hitherto unknown. We have obtained room temperature stable gamma-lactone gold(I) complexes through the reaction of cationic Au(I) reagents with allenoates, under mild conditions. The reactions of one such complex with electrophiles yielded the expected products
绝大多数均相 Au 催化反应利用 Au 作为亲电子试剂活化不饱和碳-碳键的倾向。通常假设亲核试剂攻击金活化的碳-碳多键以产生烯基 Au 中间体,尽管这些中间体迄今为止是未知的。我们通过阳离子 Au(I) 试剂与烯丙酸在温和条件下反应获得了室温稳定的 γ-内酯金 (I) 配合物。一种这样的配合物与亲电试剂的反应产生了金催化环化的预期产物。这些结果为 Au 催化环化的机理提供了实验证据。