The First Aryne Evolution from the Reactions of Selenonium Salts with Aryllithiums
摘要:
The first example of the benzyne generation was found in the reactions of alkynylselenonium salt 1a with 1.0 equiv. of phenyllithium in THF at room temperature for 3 h. The formation of the aryne intermediate was confirmed in the reactions of alkynylselenonium salt 1b and tri-p-tolylselenonium salt 6b with tolyllithium, which gave a mixture of alkynylbiphenyl derivatives 18 and 19 in 19% yield (18:19=11:8) and a mixture of bitolyls 28 and 29 in 63% yield (28:29=2:1), respectively. The reaction mechanisms of these reactions are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.
Efficient palladium-catalyzed synthesis of substituted indoles employing a new (silanyloxyphenyl)phosphine ligand
作者:Christopher B. Lavery、Robert McDonald、Mark Stradiotto
DOI:10.1039/c2cc33071g
日期:——
The new and easily prepared OTips-DalPhos ligand (L1) offers broad substrate scope at relatively low loadings in the palladium-catalyzed C-N cross-coupling/cyclization of o-alkynylhalo(hetero)arenes with primary amines, affording indoles and related heterocyclic derivatives in high yield.
A new class of N-doped ionic PAHs<i>via</i>intramolecular [4+2]-cycloaddition between arylpyridines and alkynes
作者:Ravindra D. Mule、Aslam C. Shaikh、Amol B. Gade、Nitin T. Patil
DOI:10.1039/c8cc05743e
日期:——
Reported herein, for the first time, is a copper-promoted intramolecular [4+2]-cycloaddition cascade to access ionic N-doped polycyclic aromatic hydrocarbons (PAHs) with tunable emission wavelengths. It is shown that the reaction can be made catalytic with respect to Cu(OTf)2 when an external oxidant, Selectfluor, was used.
[EN] SILANYLOXYARYL PHOSPHINE LIGAND AND USES THEREOF IN C-N CROSS-COUPLING<br/>[FR] LIGAND À LA SILANYLOXYARYLE PHOSPHINE ET SES UTILISATIONS DANS LE COUPLAGE CROISÉ C-N
申请人:UNIV DALHOUSIE
公开号:WO2013159229A1
公开(公告)日:2013-10-31
The present invention pertains to silanyloxyaryl phosphine ligands of formula (I) and their uses with transition metal catalyst precursors for organic synthesis reactions. More particularly, the present invention pertains to the use of silanyloxyaryl phosphine ligands and with transition metal catalyst precursors in C-N cross-coupling reactions.
Gold-Catalyzed Cycloisomerization of Pyridine-Bridged 1,8-Diynes: An Expedient Access to Luminescent Cycl[3.2.2]azines
作者:Chetan C. Chintawar、Manoj V. Mane、Akash G. Tathe、Suprakash Biswas、Nitin T. Patil
DOI:10.1021/acs.orglett.9b02677
日期:2019.9.6
Gold-catalyzed diyne cycloisomerizations involving carbene/alkyne metathesis have been the focal point of attention for the past few years as it offers great potential to build complex polycyclic architectures. However, the design of novel cycloisomerizations has been mostly limited to 1,5/1,6- diynes and has remained very challenging to apply for higher 1,n-diynes. Herein, we disclose an unprecedented
Pd<sub>2</sub>dba<sub>3</sub>/Bippyphos: A Robust Catalyst System for the Hydroxylation of Aryl Halides with Broad Substrate Scope
作者:Christopher B. Lavery、Nicolas L. Rotta-Loria、Robert McDonald、Mark Stradiotto
DOI:10.1002/adsc.201300088
日期:2013.3.25
4′]bipyrazole (Bippyphos) is shown to be a robust and efficient catalystsystem for the hydroxylation of structurally diverse (hetero)arylhalides under mild conditions and with broadsubstratescope. Included in this reactivity survey is the successful synthesis of substituted benzofurans and related heteroatomic derivatives, which are formed via the hydroxylation of 2‐haloalkynylarenes. Notably, a significant