Base‐Activated Latent Heteroaromatic Sulfinates as Nucleophilic Coupling Partners in Palladium‐Catalyzed Cross‐Coupling Reactions
作者:Xinlan A. F. Cook、Loïc R. E. Pantaine、David C. Blakemore、Ian B. Moses、Neal W. Sach、Andre Shavnya、Michael C. Willis
DOI:10.1002/anie.202109146
日期:2021.10.4
effective nucleophilic reagents in Pd0-catalyzed cross-coupling reactions with aryl halides. However, metal sulfinate salts can be challenging to purify, solubilize in reaction media, and are not tolerant to multi-step transformations. Here we introduce base-activated, latent sulfinate reagents: β-nitrile and β-ester sulfones. We show that under the cross-coupling conditions, these species generate
杂芳族亚磺酸盐是Pd 0催化的与芳基卤化物交叉偶联反应中有效的亲核试剂。然而,金属亚磺酸盐的纯化、在反应介质中的溶解可能具有挑战性,并且不耐受多步转化。在这里,我们介绍碱激活的潜在亚磺酸盐试剂:β-腈和β-酯砜。我们表明,在交叉偶联条件下,这些物质原位生成亚磺酸盐,然后与(杂)芳基溴进行有效的钯催化脱亚磺交叉偶联,产生多种联芳基化合物。通过多步底物精制,这些潜在的亚磺酸盐试剂已被证明是稳定的,并且适合放大生产。