Room Temperature Fluoranthene Synthesis through Cationic Rh(I)/H8-BINAP-Catalyzed [2+2+2] Cycloaddition: Unexpected Acceleration due to Noncovalent Interactions

作     者：Abe, Ryota Nagashima, Yuki Tanaka, Jin Tanaka, Ken 

作者机构：Tokyo Inst Technol Dept Chem Sci & Engn Tokyo 1528550 Japan 

出 版 物：《ACS CATALYSIS》 (ACS Catal.)

年 卷 期：2023年第13卷第3期

页      面：1604-1613页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：JSPS (Japan) [JP21K18949, JP19H00893, JP22H05346, JP21A204, JP22J15247] Grants-in-Aid for Scientific Research [22KJ1323, 22H05346] Funding Source: KAKEN 

主　　题：alkyne DFT calculation fluoranthene H-8-BINAP noncovalent interaction rhodium [2+2+2] cycloaddition 

摘      要：The fluoranthene skeleton is a structure often found in natural products and fluorescent materials, and thus developing an operationally simple method for diversity-oriented fluoranthene synthesis is an important research topic in organic synthesis. However, existing synthetic methods require harsh reaction conditions or limited substrate applicability or both. Here, we report the room temperature synthesis of substituted fluoranthenes and azafluoranthenes through the cationic Rh(I)/H-8-BINAP complex-catalyzed [2 + 2 + 2] cycloaddition using 1,8-dialkynylnaphthalenes. DFT calculations reveal that the H-8- BINAP ligand stabilizes the intermediates, allowing the room temperature reaction. Among the substrates examined, 1,8-bis(phenylethynyl)naphthalene and diarylacetylenes show high reactivity, contrary to the reactivity predicted by their steric bulkiness. Theoretical and experimental mechanistic studies have demonstrated that the noncovalent interactions of the phenyl groups on both the substrates and the ligand accelerate the present sterically demanding reactions by stabilizing the transition states rather than inducing steric repulsions.