Lewis Acid-Promoted Synthesis of Unsymmetrical and Highly Functionalized Carbazoles and Dibenzofurans from Biaryl Triazenes: Application for the Total Synthesis of Clausine C, Clausine R, and Clauraila A
作者:Weijun Yang、Jun Zhou、Binjie Wang、Hongjun Ren
DOI:10.1002/chem.201102802
日期:2011.12.2
A natural approach: A Lewis acid‐promoted nucleophilic aromatic substitution approach to the regioselective synthesis of highly substituted carbazoles and dibenzofurans has been developed. The annulation process is applied to the totalsynthesis of carbazole alkaloids clausineC, clausineR, and clauraila A (see scheme).
Simple, Convenient, and Efficient Synthesis of 2-Aryl-substituted Benzo[b]furans
作者:Yong Jiang、Botao Gao、Wenjuan Huang、Yongmin Liang、Guosheng Huang、Yongxiang Ma
DOI:10.1080/00397910701860323
日期:2008.12.31
convenient, and efficient one-pot method for the preparation of benzofuran is reported. Sonogashira coupling reaction of aryl iodides with 2-methyl-3-butyn-2-ol was used as an acetylene source in the presence of Pd(PPh3)2Cl2 and CuI. Deprotection of the acetylene moiety in the same pot using a strong base and the second Sonogashira coupling/cyclization of and substituted o-iodophenols led to the formation
Synthesis of Stannylated Aryl Imines and Amines
<i>via</i>
Aryne Insertion Reactions into Sn−N Bonds
作者:Eva Kran、Christian Mück‐Lichtenfeld、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/chem.202101124
日期:2021.6.25
The reaction of in situ generated arynes with stannylated imines to provide ortho-stannyl-aniline derivatives is reported. The readily prepared trimethylstannyl benzophenone imine is introduced as an efficient reagent to realize the aryne σ-insertion reaction. The imine functionality is an established N-protecting group and insertions proceed with good yields and good to excellent regioselectivities
报道了原位生成的芳烃与甲锡烷基化亚胺反应以提供邻-甲锡烷基-苯胺衍生物。引入容易制备的三甲基甲锡烷基二苯甲酮亚胺作为实现芳炔σ-插入反应的有效试剂。亚胺官能团是一个已建立的 N 保护基团,插入以良好的产率和良好的区域选择性进行。由于三甲基甲锡烷基部分提供了丰富的化学,产品苯胺是后续化学的宝贵起始材料。
Palladium-Catalyzed Chemoselective Oxidative Addition of Allyloxy-Tethered Aryl Iodides: Synthesis of Medium-Sized Rings and Mechanistic Studies
This Letter describes a Pd-catalyzed Tsuji–Trost-type/Heck reaction with allyloxy-tethered aryliodides and aziridines. The strategy provides efficient access to benzannulated medium-sized rings via intermolecular cyclization. The substrate aryliodide has two oxidative addition sites, that is, the aromatic C–I bond and the allyl–oxygen bond. The chemoselective oxidative addition of allyl–oxygen bonds
Microwave-assisted efficient synthesis of 2-arylbenzo[b]furans and 2-ferrocenylbenzo[b]furans from readily prepared propargylic alcohols and o-iodophenols
one-pot with iodobenzene, 2-methyl-3-butyn-2-ol and 2-iodo-4-methylphenol as reactants. A simple and efficient method for synthesis of 2-arylbenzo[b]furnas and 2-ferrocenylbenzo[b]furans has been developed from the Sonogashira coupling/cyclization reaction of propargylic alcohols and o-iodophenols in the presence of silica gel and catalytic amounts of PdCl2(PPh3)2 (2 mol%) and CuI (2 mol%) under microwave