react with alkynoic acids (AAs) to achieve gold‐catalyzed highly selective cascade reactions to furnish novel indole‐fused skeletons. Furthermore, with this powerful gold catalytic system, a library of indole/pyrrole/thiophene/benzene/naphthalene/pyridine‐based nitrogen‐containing heterocyclic compounds (NCHCs) with scaffold diversity and molecular complexity was constructed rapidly using various amine
Synthesis, Crystal Structure and Biological Activity of Novel<i>N</i>-substituted Diazabicyclo Derivatives
作者:Fei Ye、Chen Wang、Peng Ma、Li-Xia Zhao、Shuang Gao、Ying Fu
DOI:10.1002/jhet.3057
日期:2018.1
A series of N‐substituted diazabicyclo derivatives were designed and synthesized based on the active subunit combination and structure–activity relationship theory. The compounds were prepared by levulinic acid or ester with diamine, then acylation with phenoxy acetyl chloride or acetoxy acetyl chloride. All the structures were characterized by IR, 1H NMR, 13C NMR, MS, and elemental analysis. The single
基于活性亚基组合和结构-活性关系理论,设计和合成了一系列N-取代的二氮杂双环衍生物。通过乙酰丙酸或与二胺的酯,然后用苯氧基乙酰氯或乙酰氧基乙酰氯酰化来制备化合物。通过IR,1 H NMR,13 C NMR,MS和元素分析对所有结构进行表征。化合物4a的单晶通过X射线晶体学测定。初步的生物分析表明,所有产品都可以在一定程度上保护大豆免受2,4-D丁酸酯所造成的伤害。
Synthesis and spectroscopic characterizations of both 4b,5-dihydro-4b-methyl-11<i>H</i>-isoindolo[2,1-<i>a</i>]benzimidazol-11-ones and 2,3,3a,4-tetrahydro-3a-methyl-1H-pyrrolo[1,2-<i>a</i>]benzimidazol-1-ones
The complete assignment of the 1H and 13C nmr spectra of some derivatives of both4b,5-dihydro-4b-methyl-11H-isoindolo[2,1-a]benzimidazol-11-one I and 2,3,3a,4-tetrahydro-3a-methyl-1H-pyrrolo[1,2-a]-benzimidazol-1-one II was herein reported by the combined use of one and two-dimensional nmr techniques. Eight compounds, three of which are novel, 2a, 3, 6, were thus prepared. Their uv and ir spectra
4b,5-dihydro-4b-methyl-11 H -isoindolo [2,1- a ] benzimidazol-11-one I and 2,3,3a的某些衍生物的1 H和13 C nmr光谱的完全分配本文通过一维和二维NMR技术的结合报道了,4-四氢-3a-甲基-1 H-吡咯并[1,2 - a ]-苯并咪唑-1-酮II。由此制备了八种化合物,其中三种是新颖的,即2a,3、6。还获得了它们的紫外光谱和红外光谱。另外,还报道了化合物1、2a,2b,3和6的质谱。
Au(I)-Catalyzed Cascade Reaction Involving Formal Double Hydroamination of Alkynes Bearing Tethered Carboxylic Groups: An Easy Access to Fused Dihydrobenzimidazoles and Tetrahydroquinazolines
作者:Nitin T. Patil、Anil Kumar Mutyala、Pediredla G. V. V. Lakshmi、Balakrishna Gajula、Balasubramanian Sridhar、Gurava Reddy Pottireddygari、Tadikamalla Prabhakar Rao
DOI:10.1021/jo1013228
日期:2010.9.3
A process involving gold(I)-catalyzed formal double hydroamination of alkynes, bearing a tethered carboxylic group, for the synthesis of fused dihydrobenzimidazoles and tetrahydroquinazolines has been developed. A series of transition metal catalysts have been screened for this transformation, and a catalyst system consisting of Ph3PAuCl (1 mol %) and AgOTf (1 mol %) was found to be the best. The procedure entails the reaction of easily accessible starting materials such as alkynoic acids and 1,2-diaminobenzenes/2-aminobenzylamines in the presence of the catalyst in 1,2-dichloroethane at 100 degrees C. In the case of alpha-substituted alkynoic acids, the corresponding products were obtained in high diastereoselectivities; the structure of the diastereomers has been unambiguously characterized by NMR techniques. The mechanism of the reaction is discussed, and the origin of the diastereoselectivities is addressed. It was observed that under the microwave irradiation conditions, the reaction time is significantly shortened (0.5 h).
Chimirri, Alba; Grasso, Silvana; Longeri, Marcello, Journal of Chemical Research, Miniprint, 1984, # 3, p. 601 - 618
作者:Chimirri, Alba、Grasso, Silvana、Longeri, Marcello、Menniti, Giuseppa、Romeo, Giovanni、Valle, Giovanni