在Au我催化的2- alkynylphenol衍生物的氟化水合的Selectfluor的存在[1-氯甲基-4-氟-1,4- diazoniabicyclo- [2.2.2]辛烷双(四氟硼酸盐)]已被开发。该方法可在Au I / Au III氧化还原催化循环的基础上,一步一步直接获得具有C-O,C = O和C-F键的α-氟苯并呋喃酮。还进行了一些对照实验,包括该反应的不对称变体,以深入了解反应机理。
[reaction: see text] A metalative 5-endo-dig cyclization reaction of 2-ynylphenoles or anilines effected by BuLi and ZnCl(2) produces 3-zinciobenzoheteroles in excellent yield. These intermediates have been transmetalated to the corresponding cuprates and allowed to react with electrophiles to produce a variety of 2,3-disubstituted benzofurans and indoles.
Thermal [2 + 2]-cycloaddition between silylalkynes and allenylphenols followed by the nucleophilic addition of water: metal-free and economical synthesis of arylcyclobutenals
作者:Shohei Ohno、Ramon Francisco Avena、Hiroshi Aoyama、Hiromichi Fujioka、Mitsuhiro Arisawa
DOI:10.1039/c9gc04184b
日期:——
A novel thermal [2 + 2]-cycloaddition between silylalkynes and allenylphenols to form a cyclobutachromene intermediate, followed by the nucleophilic addition of water to yield functionalized arylcyclobutenals.
A Facile Construction of Bisheterocyclic Methane Scaffolds through
<scp>Palladium‐Catalyzed</scp>
Domino Cyclization
作者:Hongbo Qi、Kaiming Han、Shufeng Chen
DOI:10.1002/cjoc.202100242
日期:2021.10
A convenient palladium-catalyzed domino cyclization reaction for the construction of bis(benzofuranyl)methanescaffolds bearing an all-carbon quaternary center has been described. In the cascade process, one C(sp2)—O bond, two C(sp2)—C(sp3) bonds as well as two benzofuran rings are formed in a single synthetic sequence. The approach shows wide scope of substrates and good functional-group tolerance
Access to 6H-naphtho[2,3-c]chromenes by a palladium-catalyzed reaction of 2-haloaryl allene with 2-alkynylphenol
作者:Xiaolin Pan、Mo Chen、Liangqing Yao、Jie Wu
DOI:10.1039/c4cc00374h
日期:——
A palladium-catalyzed reaction of 2-haloaryl allene with 2-alkynylphenol is described, leading to 6H-naphtho[2,3-c]chromenes in good to excellent yields. This transformation proceeds efficiently with excellent chemoselectivity and regioselectivity.
Facile synthesis of 2-substituted benzo[<i>b</i>]furans and indoles by copper-catalyzed intramolecular cyclization of 2-alkynyl phenols and tosylanilines
CuCl and Cs2CO3 was employed to synthesize a variety of 2-substituted benzo[b]furans and indoles by an intramolecular cyclization of 2-alkynyl phenols and tosylanilines. This protocol features mild conditions, high yields and broad substrate scope, which makes it a practical method for the synthesis of 2-substituted benzo[b]furans and indoles.
催化量的 CuCl 和 Cs 2 CO 3用于通过 2-炔基酚和甲苯磺酰苯胺的分子内环化合成各种 2-取代的苯并[ b ]呋喃和吲哚。该方案条件温和、产率高、底物范围广,是合成2-取代苯并[ b ]呋喃和吲哚的实用方法。