Cyanide‐Free Cyanation of sp
<sup>2</sup>
and sp‐Carbon Atoms by an Oxazole‐Based Masked CN Source Using Flow Microreactors
作者:Brijesh M. Sharma、Arun V. Nikam、Santosh Lahore、Gwang‐Noh Ahn、Dong‐Pyo Kim
DOI:10.1002/chem.202103777
日期:2022.4.6
desired cyano compounds with reasonably good yields in a four-step flow manner. A unique feature of this cyanation protocol in flow enables to cyanate a variety of sp2 and sp carbons to produce a broad spectrum of aryl acetonitrile. It is envisaged that the OxBA based cyanation would replace existing unstable and toxic approaches as well as non-toxic cyanation using two different sources of "C" and "N"
这项工作报告了一种无氰连续流动工艺,用于将 sp2 和 sp 碳氰化以从 (5-methyl-2-phenyloxazol-4-yl) 硼酸 [OxBA] 试剂作为唯一来源合成芳基、乙烯基和炔属腈碳结合掩蔽-CN 源。无毒且稳定的 OxBA 试剂是通过溴恶唑的锂化-硼化,以及连续的 Suzuki-Miyaura 与芳基、乙烯基或炔属卤化物的交叉偶联和去掩蔽 [4+2]/retro-[4+2] 生成的以四步流动的方式成功完成了以相当好的收率得到所需氰基化合物的序列。这种氰化方案在流动中的一个独特特点是能够氰化各种 sp2 和 sp 碳以产生广谱的芳基乙腈。