نتایج جستجو برای: fiedel crafts cyclisation

تعداد نتایج: 2582  

Journal: :Organic & biomolecular chemistry 2010
Uli Kazmaier Andrea Persch

A wide range of 5-substituted thiazoles are easily accessible via cross coupling of thiazolyl triflates. These activated thiazoles can be obtained by Ugi reactions using thioacids (thio-Ugi-reaction) and subsequent cyclisation of the endo thiopeptides formed with triflic anhydride. In addition, cyclisations with acyl halides give rise to 5-acyloxysubstituted derivatives.

Journal: :Chemical communications 2012
Utpal Das Chan-Hui Huang Wenwei Lin

An organocatalytic construction of optically enriched substituted pyran derivatives via amine-catalyzed Michael addition and subsequent enolization/cyclisation has been described starting from electronically poor alkenes. Functionalized pyrans were obtained in high enantioselectivities (up to 96%) and good yields (up to 90%) having three contiguous chiral centers.

Journal: :Chemical communications 2012
Virtudes Pardo-Rodríguez Elena Buñuel Daniel Collado-Sanz Diego J Cárdenas

Reaction of a variety of 1,7-enynes with bis(pinacolato) diboron catalysed by Pd bis(trifluoroacetate) affords homoallylic and allylic boronates containing a six membered carbo- or heterocycle, by formation of C-C and C-B bonds.

2013
Eloi Coutant Paul C Young Graeme Barker Ai-Lan Lee

A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel-Crafts allylation/intramolecular hydroalkoxylation sequence. The reaction is mild, practical and tolerant of a wide variety of substituents on the phenol.

Journal: :Chemical communications 2007
Doo Seong Choi Jin Hong Kim Ueon Sang Shin Ravindra R Deshmukh Choong Eui Song

By employing superacidic fluoroantimonate ionic liquid (IL), [bmim][Sb(2)F(11)], as catalyst, not only thermodynamically-controlled but also kinetically-controlled Friedel-Crafts alkenylations of arenes with alkynes have been realized for the first time.

Journal: :Chemical communications 2003
Gauthier Winé Joseph Matta Jean-Philippe Tessonnier Cuong Pham-Huu Marc-Jacques Ledoux

Beta zeolite supported on silicon carbide, with high thermal conductivity and high mechanical strength, was successfully used as an active and stable catalyst for Friedel-Crafts reactions in a fixed bed configuration.

Journal: :Chemical communications 2011
Saumen Hajra Sukanta Bar

A-86929, a dopamine D1 agonist was synthesized with 95% ee in five steps with overall yield of 56% via catalytic enantioselective one-pot aziridination followed by Friedel-Crafts cyclization and a mild Pictet-Spengler cyclization protocol.

Journal: :Organic & biomolecular chemistry 2008
Weidong Rao Philip Wai Hong Chan

Friedel-Crafts allylic alkylation of a wide variety of aromatic and heteroaromatic compounds with allylic alcohols catalysed by AuCl(3) (5 mol%) under mild conditions at room temperature was accomplished in good to excellent yields (up to 99%) and regioselectivity.

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