Partially Hydrogenated 7-Oxa[5]helicenes and [5]Helicenes: Synthesis, Structures, and Dynamics
作者:Atul Goel、Deepti Verma、Ramendra Pratap、Gaurav Taneja、Yasmin Hemberger、Michael Knauer、Resmi Raghunandan、Prakas Ranjan Maulik、Vishnu Ji Ram、Gerhard Bringmann
DOI:10.1002/ejoc.201001565
日期:2011.6
convenient synthesis of partially hydrogenated functionalized [5]helicenes and oxa[5]helicenes, such as (1,2,5,6-tetrahydro-3-oxa-dibenzo[c,g]phenanthren-4-ylidene)acetonitriles 6 and (5,6-dihydro-3-oxa-dibenzo[c,g]phenanthren-4-ylidene)acetonitriles 8, has been developed through base-catalyzed ring transformation of 5,6-dihydro-4-amin-1-yl-2-oxo-2Hbenzo[h]chromene-3-carbonitriles 4 by 2-tetralones 5. The
部分氢化功能化 [5] 螺旋烯和氧杂 [5] 螺旋烯的高效便捷合成,例如 (1,2,5,6-四氢-3-氧杂-二苯并[c,g]菲-4-亚基)乙腈6 和 (5,6-dihydro-3-oxa-dibenzo[c,g] phenanthren-4-ylidene) 乙腈 8,已通过 5,6-dihydro-4-amin-1- 的碱催化环转化而开发yl-2-oxo-2Hbenzo[h]chromene-3-carbonitriles 4 by 2-tetralones 5. 部分氢化的oxahelicenes 的分子结构通过光谱方法和X 射线晶体学分析进行检查。为了计算对映异构体 P-6e 和 M-6e 以及 P-8a 和 M-8a 的反转势垒,通过密度泛函理论 (DFT) 优化了基态和过渡态的分子几何结构) 使用 B3LYP/6-311G*。基于这些结构,计算 RI-SCS-MP2/TZVP 单点能量