Durch Reduktion von Phenanthridin-jodmethylat mit LiAlH 4 oder Zinn undSalzsäure,ferner durch Reduktion von N-Methyl-phenanthridon mit LiAlH 4 entsht dasselbe N-Methyl-o-dihydro-phenanthridin vmp Smp。48°。在二恶英中的二元二烯命名法是由N-甲基-邻二氮杂菲和N-甲基-邻二氢菲啶酮在世界上最常见的N-甲基-菲咯啉酮的氧化制得的。DieseOxydationsvorgängewurdennäherverfolgt。
A novel C–C radical–radical coupling reaction promoted by visible light: facile synthesis of 6-substituted N-methyl 5,6-dihydrobenzophenanthridine alkaloids
A photoredox mediated radical–radical coupling ofN-methyl 5,6-dihydrobenzophenanthridine alkaloids with α-electron withdrawing group substituted bromoalkane has been developed.
Give me a ring? An efficient approach has been developed for the intramolecular decarboxylative coupling of arene carboxylicacids/esters with aryl bromides catalyzed by palladium (see scheme). From a synthetic viewpoint, this method is highly attractive because the catalyst loading is low, the optimized reaction conditions are mild, and the substrate scope is broad.
Neocuproine–KOtBu promoted intramolecular cross coupling to approach fused rings
作者:Chang-Liang Sun、Yi-Fan Gu、Wei-Ping Huang、Zhang-Jie Shi
DOI:10.1039/c1cc13907j
日期:——
Polycycles can be produced with different linkages (A, B = O, N, C, S) by constructing biaryl CâC bonds vianeocuproineâKOtBu promoted cross coupling between CâXs and CâHs.
多环化合物可以通过构建联芳基C–C键,在二茂铜–KOtBu促进下,通过C–X和C–H之间的交叉偶联反应,利用不同的键合方式(A, B = O, N, C, S)来合成。
Synthesis of Functionalized Indole- and Benzo-Fused Heterocyclic Derivatives through Anionic Benzyne Cyclization
作者:José Barluenga、Francisco J. Fañanás、Roberto Sanz、Yolanda Fernández
six-membered benzo-fused N-, O-, and S-heterocycles is reported. The key step involves the generation of a benzyne-tethered vinyl or aryllithium compound that undergoes a subsequent intramolecular anionic cyclization. Reaction of the organolithium intermediates with selected electrophiles allows the preparation of a wide variety of indole, tetrahydrocarbazole, dihydrofenantridine, dibenzopyran, and dibenzothiopyran
Steric Effects on the Primary Isotope Dependence of Secondary Kinetic Isotope Effects in Hydride Transfer Reactions in Solution: Caused by the Isotopically Different Tunneling Ready State Conformations?
作者:Binita Maharjan、Mahdi Raghibi Boroujeni、Jonathan Lefton、Ormacinda R. White、Mortezaali Razzaghi、Blake A. Hammann、Mortaza Derakhshani-Molayousefi、James E. Eilers、Yun Lu
DOI:10.1021/jacs.5b03085
日期:2015.5.27
has been widely used to explain the 1° isotope dependence of 2° KIEs in the enzyme-catalyzed H-transfer reactions. The behaviors of the 1° isotope dependence of 2° KIEs in solution are compared to those with alcohol dehydrogenases, and sources of the observed "puzzling" 2° KIE behaviors in these enzymes are discussed using the concept of the isotopicallydifferent TRS conformations.
在 H 转移反应中观察到的 1° 同位素对 2° KIE 的影响最近基于 H 隧道机制进行了解释,该机制使用的概念是,较重同位素的隧道需要更短的供体 - 受体距离(DAD)比较轻的同位素。与 H 隧道相比,D 隧道中较短的 DAD 可以带来显着的空间拥挤效应,使 2° H/D 振动变硬,从而降低 2° KIE。这导致了一个新的物理有机研究方向,该方向研究结构如何影响 2° KIE 的 1°同位素依赖性,以及这种依赖性如何提供有关隧道准备状态 (TRS) 结构的信息。假设是 H 和 D 隧道具有具有不同 DAD 的 TRS 结构,并且在空间位阻的隧道系统中应该观察到对 2° KIE 的明显 1° 同位素效应。本文通过确定溶液中从各种氢化物供体到不同碳阳离子氢化物受体的氢化物转移反应中 α- 和 β-2° KIE 的 1° 同位素效应来研究这一假设。该系统旨在包括空间基团和 TRS 中目标 2°