nucleophilic addition/annulation reaction of ortho-alkynylbenzaldehydes in the presence of methanol. The reactions of aryl-, trimethylsilyl- and diethoxymethyl-substituted alkynylbenzaldehydes occurred with complete regioselectivity in good to excellent yields undermicrowaveirradiation. The reactions of alkyl-substituted alkynylbenzaldehydes took place with good yields and high regioselectivity only when
A series of neglected 1‐aminoisochromenes have been prepared under mild condition by a selective dominoreaction between 2‐alkynylbenzaldehydes and electron‐poor anilines catalyzed by original silver(I) complexes characterized by the presence of a pyridine containing macrocyclic ligand [AgIPcL].
在温和的条件下,通过以原始的银(I)配合物为特征的2-炔基苯甲醛与贫电子苯胺之间的选择性多米诺反应,制备了一系列被忽略的1-氨基异色酮,其特征在于存在含吡啶环的大环配体[Ag I PcL] 。
Silver-Catalysed Domino Approach to 1,3-Dicarbo-Substituted Isochromenes
triflate-catalyzed synthesis of 1,3-dicarbosubstituted isochromene derivatives starting from 2-alkynyl(hetero)arylaldehydes and enolizable ketones. The reaction proceeds in a cascade fashion under mild heating with complete regioselectivity. The reaction yields range from moderate to good. In some cases, the reaction gives unexpected homodimeric products. Two competitive mechanistic paths for the formation of the
Cs
<sub>2</sub>
CO
<sub>3</sub>
Catalyzed Intramolecular Aminocarbonylation of Alkynes: Synthesis of 3‐Amino‐1
<i>H</i>
‐inden‐1‐ones from
<i>N</i>
‐
<i>tert</i>
‐Butyl‐2‐(1‐alkynyl)benzaldimines
作者:Zhen Guo、Tao Liu、Xiujuan Liang、Yuting Wu、Tuanli Yao
DOI:10.1002/adsc.201901349
日期:2020.3.4
3‐amino‐1H‐inden‐1‐ones from N‐tert‐butyl‐2‐(1‐alkynyl)benzaldimines via intramolecular aminocarbonylation of alkynes using Cs2CO3 as catalyst and air as oxidant has been developed. This highly atom‐efficient, transition‐metal‐free reaction proceeds under thermal conditions. We propose that the reaction proceeds through an unprecedented 5‐exo‐dig cyclization of N‐tert‐butyl‐2‐(1‐alkynyl)benzaldimines and thermal
的各种各样的合成3-氨基-1- ħ茚-1-酮从ñ -叔丁基-2-(1-炔基)经由使用铯炔烃的分子内的氨基羰基benzaldimines 2 CO 3作为催化剂和空气作为氧化剂具有已开发。这种高原子效率,无过渡金属的反应在热条件下进行。我们建议,通过了前所未有的5-反应进行外切-挖环化ñ -叔丁基-2-(1-炔基)benzaldimines和3-亚甲基2λ热重排2 -isoindolin -1-醇。
[Ag(PcL)]‐Catalysed Domino Approach to 6‐Substituted Benzoxazino Isoquinolines
6‐Substituted benzoxazino isoquinoline nucleus, a key skeleton in some biological active molecules, can be prepared by a silver catalysed domino approach starting from 2‐alkynylbenzaldehydes and 1‐substituted (2‐aminophenyl)methanols. The silver(I) complexes of macrocyclic pyridine‐containingligands (PcL) demonstrated to be the catalysts of choice.