Photoredox Catalysis Mediated by Tungsten(0) Arylisocyanides in 1,2-Difluorobenzene
Photoredox Catalysis Mediated by Tungsten(0) Arylisocyanides in 1,2-Difluorobenzene
复制标题
DOI：
10.1021/acs.inorgchem.1c03767
复制
发表时间：
2022-05-16
影响因子：
4.6
通讯作者：
Gray, Harry B.
中科院分区：
文献类型：
--
作者：
Barth, Alexandra T.;Morales, Maryann;Gray, Harry B.
研究了1-（2-碘苄基）吡咯（IBP）和1-（2-溴苄基）吡咯（BBP）在1,2-二氟苯（DFB）中由W(CNDipp)6（CNDipp = 2,6-二异丙基苯基异氰化物）催化的5h -吡咯[2,1-a]异吲哚的光化学环化反应。辐照（445 nm） W(CNDipp)6(5 mol %) inDFB溶液1 h（16次翻转）后，将78%的IBP （50 mM）转化为产物。在DFB溶液中加入四正丁基六氟磷酸铵（TBAPF6） （0.2 M）可导致W(CNDipp)6的快速光诱导消失，但显著地没有抑制IBP的光化学环化，表明IBP的环化可能是由非发光光催化剂驱动的。
We have studied the photochemical cyclization of 1-(2-iodobenzyl)-pyrrole (IBP) and 1-(2-bromobenzyl)-pyrrole(BBP) to 5H-pyrrolo[2,1-a]isoindol catalyzed by W(CNDipp)6(CNDipp = 2,6-diisopropylphenylisocyanide) in 1,2-difluoroben-zene (DFB). Irradiation (445 nm) of W(CNDipp)6(5 mol %) inDFB solution converted 78% of IBP (50 mM) to product after 1 h(16 turnovers). Addition of tetra-n-butyl ammonium hexafluor-ophosphate (TBAPF6) (0.2 M) to the DFB solution led to rapidphotoinduced disappearance of W(CNDipp)6but, remarkably, didnot inhibit photochemical cyclization of IBP, indicating that IBPcyclization could be driven by a nonluminescent photocatalyst.