我们提出了金催化将腈还原成伯胺的第一个例子。与完全不反应的一氢硅烷相比,二乙基硅烷(一种二氢硅烷)能够在 TiO 2负载的 Au 纳米颗粒的催化下,通过平滑的双氢化硅烷化途径将芳基或烷基腈还原为伯胺。产生的不稳定的N-二甲硅烷基胺很容易被Et 2 O中的HCl脱保护,以非常好的至极好的产率形成相应胺的盐酸盐。该催化剂至少可在连续 5 次运行中回收和重复使用。
Catalytic Arylhydroxylation of Dehydroalanine in Continuous Flow for Simple Access to Unnatural Amino Acids
作者:R. Kashif M. Khan、Yang Zhao、Tal D. Scully、Stephen L. Buchwald
DOI:10.1002/chem.201804094
日期:2018.10.12
catalytic arylhydroxylation of dehydroalanine with aryldiazonium salts. Aryldiazonium salts, which are generated from aniline precursors under partially aqueous conditions in continuous flow, efficiently reacted with dehydroalanine in the presence of 10–15 mol % ferrocene to furnish α‐hydroxyarylalanine derivatives (up to 82 % yield). The reactions proceeded with regioselectivity, broad functional