Synthesis of 3-Phenyl-1H-[1,4]oxazino[4,3-a]benzimidazol-1-one and Its Transformation into 4-Phenyl-2,5-dihydro-1H-[1,2,5]triazepino[5,4-a]benzimidazol-1-one
A mild, transition metal-free, and environmentally benign NBS-promoted C–N bond formation of N-heterocycles is successfully demonstrated. A series of heterocyclic derivatives are readily prepared under mild conditions in moderate to good yields.
Regioselective Oxo-Amination of Alkenes and Enol Ethers with <i>N</i>-Bromosuccinimide–Dimethyl Sulfoxide Combination: A Facile Synthesis of α-Amino-Ketones and Esters
作者:Pragati K. Prasad、Rambabu N. Reddi、Arumugam Sudalai
DOI:10.1021/acs.orglett.5b03540
日期:2016.2.5
amines as N-sources and dimethyl sulfoxide (DMSO) as the oxidant and also leads to the production of amino alcohols in a single step on reduction, thus broadening the scope of this operationally simple reaction. For the first time, the formation of reactive Me2S+–O–Br species generated by the interaction of NBS with DMSO has been proven.
已经开发出前所未有的烯烃和烯醇醚向相应的α-亚氨基羰基化合物的转化,其具有优异的区域选择性和产率。该羰基化胺化工艺使用现成的N-溴琥珀酰亚胺(NBS)和仲胺作为N源,并使用二甲基亚砜(DMSO)作为氧化剂,而且一步一步还原就可生产氨基醇,从而扩大了范围操作上的简单反应 首次证明了NBS与DMSO相互作用产生的反应性Me 2 S + -O-Br物种的形成。
Synthesis and structural analysis of complexes based on α-amino ketone derived from benzimidazole
作者:Michaela Dina Stanescu、Cristina Stefanov、Florin Albota、Anca Hirtopeanu、Ovidiu Cristian Oprea、Nicolae Stanica、Marilena Ferbinteanu
DOI:10.1016/j.molstruc.2020.129716
日期:2021.3
ABSTRACT Two cobalt (II) and nickel (II) coordinationcompounds have been synthesized starting from2-(1H-benzimidazol-1-yl)-1-phenylethanone, an α-amino ketone with the N atom belonging to an imidazole ring. The newly synthesized compounds have been characterized by spectral methods (IR, UV-Vis-NIR), thermal analysis, magnetic data and single-crystal X-ray diffraction. The single-crystal X-ray structure
摘要 以 2-(1H-苯并咪唑-1-基)-1-苯基乙酮为原料合成了两种钴 (II) 和镍 (II) 配位化合物,该化合物是一种具有 N 原子的 α-氨基酮,属于咪唑环。新合成的化合物已通过光谱方法(IR、UV-Vis-NIR)、热分析、磁数据和单晶 X 射线衍射进行了表征。钴 (II) 配合物的单晶 X 射线结构显示四方八面体几何结构,在赤道面上有四个有机配体,在轴向位置有两个硝酸根离子。一个有趣的特征是配位单元内部的扭曲动态无序,这是由于一个分子内氢键在一个硝酸盐轴向配体和四个有机配体中的每一个之间移动。电子结构计算,在密度泛函理论 (DFT) 的框架中,正在支持这一假设,揭示优化的分子几何形状不如实验形状对称,这是等效失真的平均值。模拟的反应坐标给出了一个浅势垒,2.36 kcal/mol,用于对应于分子内松散氢键的四种等效几何形状之间的转换。进入方法论问题,我们表明在 DFT 框架中计算电子光谱的时间相关
Base-Induced One-Pot Preparation of N- or P-Substituted Alkynes
作者:Yang Zhang、Yanqin Zhang、Jing Xiao、Zhihong Peng、Wanrong Dong、Delie An
DOI:10.1002/ejoc.201501092
日期:2015.12
An efficient method for the formation of C(sp)–N or C(sp)–P bonds is described. The facile transformation proceeds under mild conditions (0 or –20 °C) in a one-pot manner, and does not require transition-metal catalysts. The base-induced protocol exhibits good functional group tolerance (up to 44 examples) and high efficiency (up to 94 % yield) towards rare heteroatom-substituted acetylenes (N or P)
Synthesis of imidazopyridine-fused indoles <i>via</i> one-pot sequential Knoevenagel condensation and cross dehydrogenative coupling
作者:Vikki N. Shinde、Shiv Dhiman、Rangan Krishnan、Dalip Kumar、Anil Kumar
DOI:10.1039/c8ob01449c
日期:——
A simple and efficient strategy for the synthesis of imidazopyridine-fused indoles has been developed that involves one-pot sequential Knoevenagelcondensation of readily available active methylene azoles with N-substituted-1H-indole-3-carboxaldehydes or N-substituted-1H-indole-2-carboxaldehydes followed by palladium-catalyzed intramolecular cross dehydrogenative coupling reaction. A series of 36 derivatives