A Photochemical Intramolecular C–N Coupling Toward the Synthesis of Benzimidazole-Fused Phenanthridines
作者:Shyamal Kanti Bera、Palash J. Boruah、Shraddha Saraswati Parida、Amit K. Paul、Prasenjit Mal
DOI:10.1021/acs.joc.1c00871
日期:2021.7.16
direct photochemical dehydrogenative C–N coupling of unactivated C(sp2)–H and N(sp2)–H bonds. The catalysts or additive-free transformation of 2-([1,1′-biphenyl]-2-yl)-1H-benzo[d]imidazole to benzo[4,5]imidazo[1,2-f]phenanthridine was achieved at ∼350 nm of irradiation via ε-hydrogen abstraction. DFT calculations helped to understand that the N–H···π interaction was essential for the reaction to proceed
在此,我们报告了未活化的 C(sp 2 )-H 和 N(sp 2 )-H 键的直接光化学脱氢 C-N 偶联。2-([1,1'-联苯]-2-基) -1H-苯并[ d ]咪唑催化剂或无添加剂转化为苯并[4,5]咪唑并[1,2- f ]菲啶通过ε-氢提取在~350 nm的辐射下实现。DFT 计算有助于理解 N–H···π 相互作用对于反应以低于预期的能量进行是必不可少的。