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.
Novel aspects on the reaction of trialkyl-(1-methylindol-2-yl)borates
作者:Minoru Ishikura、Masanao Terashima
DOI:10.1039/c39890000135
日期:——
A new use of trialkyl-(1-methylindol-2-yl)borates for the synthesis of 2-substituted indoles involving the palladium catalysed cross-coupling with vinylic and aromatic halides, or a facile alkyl migration from boron to carbon without an additional electrophile is described.
Palladium-catalyzed synthesis of indoles via ammonia cross-coupling–alkyne cyclization
作者:Pamela G. Alsabeh、Rylan J. Lundgren、Lauren E. Longobardi、Mark Stradiotto
DOI:10.1039/c1cc11874a
日期:——
The synthesis of indoles via the metal-catalyzed cross-coupling of ammonia is reported for the first time; the developed protocol also allows for the unprecedented use of methylamine or hydrazine as coupling partners. These Pd/Josiphos-catalyzed reactions proceed under relatively mild conditions for a range of 2-alkynylbromoarenes.
Cu(II)-Catalyzed Direct and Site-Selective Arylation of Indoles Under Mild Conditions
作者:Robert J. Phipps、Neil P. Grimster、Matthew J. Gaunt
DOI:10.1021/ja801767s
日期:2008.7.1
We have developed a new site-selective Cu(II)-catalyzed C-H bond funtionalization process that can selectively arlate indoles at either the C3 or C2 position under miled conditions. The scope of arylation process is broad and tolerates broad functionality on both indole and aryl unit, which makes it amenable to further elaboartion. The mechanism of the arylation reaction is proposed to proceed via a Cu(III)-aryl that undergoes intial addition at the C3 position of the indole motif. We speculate that site of indole arylation arises through a migration of the Cu(III)-aryl group of C3 to C2, and this can be controlled by the nature of the group on the nitrogen atm; free (NH)-and N-alkylindoles deliver the C3-arylated product, whereas N-acytylindoles affored the C2 isomer, both with excellent yield and selectivity.