Iron‐Catalysed Remote C(sp
<sup>3</sup>
)−H Azidation of
<i>O</i>
‐Acyl Oximes and
<i>N</i>
‐Acyloxy Imidates Enabled by 1,5‐Hydrogen Atom Transfer of Iminyl and Imidate Radicals: Synthesis of γ‐Azido Ketones and β‐Azido Alcohols
作者:Rubén O. Torres‐Ochoa、Alexandre Leclair、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201901079
日期:2019.7.17
acetylacetonate [Fe(acac)3], the reaction of structurally diverse ketoxime esters with trimethylsilyl azide (TMSN3) afforded γ‐azido ketones in good to excellent yields. This unprecedented distal γ‐C(sp3)−H bond azidation reaction went through a sequence of reductive generation of an iminyl radical, 1,5‐hydrogen atom transfer (1,5‐HAT) and iron‐mediated redox azido transfer to the translocated carbon radical
在催化量的乙酰丙酮铁(III)[Fe(acac)3 ]的存在下,结构多样的酮肟酸酯与三甲基硅烷基叠氮化物(TMSN 3)的反应可提供良好产率的γ-叠氮基酮。前所未有的远端γ-C(sp 3)-H键叠氮化反应经历了亚胺基的还原生成,1,5-氢原子转移(1,5-HAT)以及铁介导的氧化还原叠氮基转移至易位的碳自由基。TMSN 3不仅用作功能化未激活的C(sp 3)-H键的氮源,而且还用作还原剂以原位生成催化活性的Fe II。基于相同的原理,一种新颖的β-C(sp3)-H通过N-酰氧基酰亚胺的醇官能化随后被实现,在将所得的酯水解后,导致β-叠氮基醇,这是有机和药物化学的重要组成部分。