铑催化的加成控制的发散性合成四取代的1,3-烯炔和烷基化的3 H-吡咯并[1,2 - a ]吲哚-3-酮
摘要:
在这里,我们报告通过铑催化的CH链烯基化/ DG迁移和[3+]的四取代的1,3-炔烃和烷基化的3 H-吡咯并[1,2- a ]吲哚-3-酮的添加剂控制的发散合成。2]分别。该协议具有在1,3-二炔相关的C–H活化中罕见的指导基团迁移,出色的区域选择性和立体选择性,出色的单官能度(超过双官能度),广泛的底物范围,中等至高收率,良好的官能团相容性以及轻度的氧化还原中性条件。
3‐diynes is described. Key for the success of this novel transformation is the utilization of an advanced palladium catalyst system with the specific ligand Neolephos. The synthetic value of this general approach to synthetically useful α‐alkynyl‐α, β‐unsaturated amides is showcased by diversification of several structurally complex molecules and marketed drugs. Control experiments and density‐functional
1'-binaphthalene (Neolephos), which permits the palladium-catalyzed selective carbonylation under mild conditions, providing a general preparation of functionalized 1,3-enynes in good-to-high yields with excellent chemoselectivities. Synthetic applications that showcase the possibilities of this novel methodology include an efficient one-potsynthesis of 4-aryl-4H-pyrans as well as the rapid construction of various
d selective hydroarylation of unsymmetrical alkynes represents the state‐of‐art in organic chemistry, and still mainly relies on the use of precious late‐transition‐metal catalysts. Reported herein is an unprecedented MnI‐catalyzed hydroarylation of unsymmetrical 1,3‐diyne alcohols with commercially available arylboronic acids with predictive selectivity. This method addresses the challenges in regio‐
Intermolecular [3+2] Annulation of Cyclopropylanilines with Alkynes, Enynes, and Diynes<i>via</i>Visible Light Photocatalysis
作者:Theresa H. Nguyen、Scott A. Morris、Nan Zheng
DOI:10.1002/adsc.201400742
日期:2014.9.15
simple starting materials remain rare. We recently developed an intermolecular [3+2] annulation of cyclopropylanilines with alkenes and alkynes that enables this one‐step synthesis. Herein, we report our findings for a full‐scale study of the annulation. Significant expansion of the substrate scope for both cyclopropylanilines and alkynes has been achieved. A range of structurally diverse carbocycles
Glaser–Hay hetero-coupling in a bimetallic regime: a Ni(<scp>ii</scp>)/Ag(<scp>i</scp>) assisted base, ligand and additive free route to selective unsymmetrical 1,3-diynes
作者:Anuradha Mohanty、Sujit Roy
DOI:10.1039/c7cc05605b
日期:——
A Ni(OAc)2/Ag(OTf) catalysed coupling of aryl alkynes and propargylic alcohol/ether/ester gave the corresponding unsymmetrical 1,3-diynes in good to excellent yields.