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.
[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.
Selective carbon–carbon bond activation is important in chemical industry and fundamental organic synthesis, but remains challenging. In this study, non-polar unstrained Csp2–Csp3 and Csp2–Csp2 bond activation was achieved by B(OMe)3/B2pin2-mediated fragmentation borylation. Various indole derivatives underwent C2-regioselective C–C bond activation to afford two C–B bonds under transition-metal-free
The Selective Cross-Coupling of Secondary Alkyl Zinc Reagents to Five-Membered-Ring Heterocycles Using Pd-PEPPSI-IHept<sup>Cl</sup>
作者:Bruce Atwater、Nalin Chandrasoma、David Mitchell、Michael J. Rodriguez、Matthew Pompeo、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201503941
日期:2015.8.10
leads to β‐hydride elimination. Whereas catalysts have been reported that provide decent selectivity for the expected (non‐rearranged) cross‐coupled product with aryl or heteroaryl oxidative‐addition partners, none have shown reliable selectivity with five‐membered‐ring heterocycles. In this report, a new, rationally designed catalyst, Pd‐PEPPSI‐IHeptCl, is demonstrated to be effective in selective
[1,2]-Aryl migration in the synthesis of substituted indoles: scope, mechanism, and high throughput experimentation
作者:Tao Pei、David M. Tellers、Eric C. Streckfuss、Cheng-yi Chen、Ian W. Davies
DOI:10.1016/j.tet.2008.11.026
日期:2009.4
A mild regioselective synthesis of substitutedindoles from readily accessible 1-(2-aminophenyl)-2-chloroethanones is described. Addition of a range of carbon nucleophiles to α-chloro acetophenones 1 generates 2-substituted indoles 2 in moderate to excellent yields. A reaction mechanism involving a [1,2]-arylmigration is proposed. This useful transformation is further examined using high throughput