Transition-metal-free synthesis of indole-fused dibenzo[b,f][1,4]oxazepines via Smiles rearrangement
作者:Fangdong Hu、Huanhuan Liu、Jiong Jia、Chen Ma
DOI:10.1039/c6ob02098d
日期:——
transition-metal-free approach for the synthesis of indole-fused dibenzo[b,f][1,4]oxazepines from 2-(1H-indol-2-yl)phenol and 1,2-dihalobenzenes or 2 halonitroarenes has been developed. The proposed mechanism for this transformation features a Smiles rearrangement favoured over a direct intramolecular nucleophilic cyclization, which affords the corresponding products in different regioselectivities
One-Pot Highly Regioselective Synthesis of Indole-Fused Pyridazino[4,5-b][1,4]benzoxazepin-4(3H)-ones by a Smiles Rearrangement
作者:Xiaolei Jiang、Fangdong Hu
DOI:10.1055/s-0037-1609338
日期:2018.6
A simple and convenient synthesis of indole-fused pyridazino[4,5-b][1,4]benzoxazepin-4(3H)-ones is described. A range of 2-(1H-indol-2-yl)phenols and 4,5-dichloropyridazin-3-ones are compatible with this reaction. A Smiles rearrangement is proposed as a key step in the highly regioselective construction of the products. The easy availability of the starting materials makes this an appealing method
A Formal [5+1] Annulation Reaction of Sulfur Ylides and 2-(1<i>H</i>-indol-2-yl)phenols: Access to Indole-Fused 4<i>H</i>-benzo[<i>e</i>][1,3]oxazines
作者:Penghao Jia、You Huang
DOI:10.1002/adsc.201800573
日期:2018.8.17
The first sulfur ylides involved formal [5+1]‐annulation reaction was developed between prop‐2‐ynylsulfonium salts and 2‐(1H‐indol‐2‐yl)phenols. Prop‐2‐ynylsulfonium salt participates in the reaction with its β‐carbon atom and acts as a novel C1 synthon. Various indole‐fused 4H‐benzo[e][1,3]oxazines bearing a thioether moiety were constructed in good to high yields under mild conditions.
在丙-2-炔基ulf盐和2-(1 H-吲哚-2-基)酚之间开发了第一个正式的[5 + 1]-环化反应的硫酰化物。丙-2-炔基salt盐与其β-碳原子参与反应,并充当新型C 1合成子。在温和条件下,以良好或高收率构建了各种带有硫醚部分的吲哚稠合的4 H-苯并[ e ] [1,3]恶嗪。
A Convenient Synthesis of Fluoroalkylated Benzimidazole‐ or Indole‐fused Benzoxazines
Described herein is the first synthesis of fluoroalkylated benzimidazole- or indole-fused benzoxazines by using fluoroalkylated propiolates as building blocks. The benzimidazole-fused products were obtained by a convenient one-pot two-step process, a feature that may make this protocol attractive. The incorporation of a fluoroalkyl group into these heterocycles may provide more opportunities for drug
A new palladium-catalyzed annulative allylic alkylation (AAA) reaction of 2-(indol-2-yl)phenols with dual allylic electrophiles such as isobutylene dicarbonate and butene dicarbonate is described, leading to the regioselective synthesis of tetracyclic medium-sized cyclic ethers possessing a bridged aryl-indole scaffold, namely, benzo[2,3]oxocino[4,5-b]indoles and benzo[2,3]oxepino[4,5-b]indoles, in
描述了一种新的钯催化的2-(吲哚-2-基)苯酚与二碳酸异丁烯和二碳酸丁烯等双烯丙基亲电子试剂的环烯丙基烷基化 (AAA) 反应,导致四环中等尺寸环醚的区域选择性合成桥联芳基吲哚支架,即苯并[2,3]氧辛基[4,5- b ]吲哚和苯并[2,3]氧吡啶[4,5- b ]吲哚,产率良好至优异。该方案展示了广泛的底物范围、与取代基的良好兼容性和高区域选择性,为创建桥联芳基吲哚骨架提供了一种催化和灵活的方法。