PROCESS FOR THE PRODUCTION OF 4-SUBSTITUTED CHROMANES VIA GOLD CATALYSIS
申请人:Council of Scientific and Industrial Research
公开号:US20150005514A1
公开(公告)日:2015-01-01
Disclosed herein is single step process for the synthesis of 4-aryl substituted chromanes of compound of formula 2 comprising subjecting 3-aryloxy-1-phenylpropan-1-ol of formula 1 to gold(III) chloride-catalyzed intramolecular Friedel-Crafts reaction to obtain 4-aryl substituted chromanes. The invention further discloses novel 4-substituted Chromane compounds.
[EN] PROCESS FOR THE PRODUCTION OF 4-SUBSTITUTED CHROMANES VIA GOLD CATALYSIS<br/>[FR] PROCÉDÉ DE PRODUCTION DE CHROMANES 4-SUBSTITUÉS CATALYSÉ PAR L'OR
申请人:COUNCIL SCIENT IND RES
公开号:WO2013088455A1
公开(公告)日:2013-06-20
Disclosed herein is single step process for the synthesis of 4-aryl substituted chromanes of compound of formula 2 comprising subjecting 3-aryloxy-l-phenylpropan-l-ol of formula 1 to gold (III) chloride-catalyzed intramolecular Friedel-Crafts reaction to obtain 4-aryl substituted chromanes. The invention further discloses novel 4-substituted Chromane compounds.
Tosylhydrazine mediated conjugate reduction of 2-hydroxyl chalcones and sequential reductive coupling cyclization is described. This is an unprecedented protocol and an extremely efficient method for a one-pot domino synthesis of 2-arylchromans in good to excellent yields from commercially available, cheap starting materials. More importantly, the two-step reactions can be easily controlled to afford dihydrochalcones or 2-arylchromans by the mole amounts of tosylhydrazine. Furthermore, the operational simplicity of the process and the high functional group tolerance are remarkable. (C) 2015 Elsevier Ltd. All rights reserved.
US9102646B2
申请人:——
公开号:US9102646B2
公开(公告)日:2015-08-11
Efficient Synthesis of the Spiroacetal Core of Paecilospirone via Oxidative Radical Cyclisation