Functionalization of 1<i>N</i>-Protected Tetrazoles by Deprotonation with the Turbo Grignard Reagent
作者:Konstantinos Grammatoglou、Aigars Jirgensons
DOI:10.1021/acs.joc.1c02926
日期:2022.3.4
1N-PMB-protected tetrazole undergoes C–H deprotonation with the turbo Grignard reagent, providing a metalated intermediate with increased stability. This can be used for the reaction with electrophiles such as aldehydes, ketones, Weinreb amides, and iodine. C–H deprotonation with the turbo Grignard reagent is compatible with the PMB-protecting group at the tetrazole, which can be cleaved using oxidative hydrogenolysis
1 N -PMB 保护的四唑在涡轮格氏试剂的作用下发生 C-H 去质子化,从而提供稳定性更高的金属化中间体。这可用于与醛、酮、Weinreb 酰胺和碘等亲电子试剂的反应。使用 turbo Grignard 试剂进行 C-H 去质子化与四唑上的 PMB 保护基团相容,可以使用氧化氢解和酸性条件将其裂解。该方法通过克服与金属化中间体的逆[2 + 3]环加成相关的困难,实现了在第五位的四唑官能化。