Practical synthesis of biaryl colchicinoids containing 3′,4′-catechol ether-based A-rings via Suzuki cross-coupling with ligandless palladium in water
摘要:
Eight new biaryl colchicinoids containing 3',4'-methylene or benzodioxy ether bridges were synthesized. The key synthetic step employed a ligandless, aqueous Suzuki cross-coupling reaction catalyzed by Pd(OAc)(2) with tetrabutylammonium bromide (TBAB) and potassium carbonate (K2CO3). The biaryl Suzuki products were typically formed in 5-30 min and always in less than 1 h. (C) 2003 Elsevier Ltd. All rights reserved.
Concise Enantioselective Total Syntheses of (+)-Homochelidonine, (+)-Chelamidine, (+)-Chelidonine, (+)-Chelamine and (+)-Norchelidonine by a PdII-Catalyzed Ring-Opening Strategy
作者:Matthew J. Fleming、Helen A. McManus、Alena Rudolph、Walter H. Chan、Jérémy Ruiz、Chris Dockendorff、Mark Lautens
DOI:10.1002/chem.200701775
日期:2008.2.27
II-catalyzed asymmetric ring-opening reaction of a meso-azabicyclic alkene with an aryl boronic acid as the key step. By screening a variety of functionalized ortho-substituted aryl boronic acids, chiral ligands and reaction conditions we were able to prepare the requisite cis-1-amino-2-aryldihydronaphthalenes in high yield and in up to 90 % ee. Early attempts to complete the synthesis of (+)-homochelidonine
Practical synthesis of biaryl colchicinoids containing 3′,4′-catechol ether-based A-rings via Suzuki cross-coupling with ligandless palladium in water
作者:Amy Morin Deveau、Timothy L. Macdonald
DOI:10.1016/j.tetlet.2003.11.016
日期:2004.1
Eight new biaryl colchicinoids containing 3',4'-methylene or benzodioxy ether bridges were synthesized. The key synthetic step employed a ligandless, aqueous Suzuki cross-coupling reaction catalyzed by Pd(OAc)(2) with tetrabutylammonium bromide (TBAB) and potassium carbonate (K2CO3). The biaryl Suzuki products were typically formed in 5-30 min and always in less than 1 h. (C) 2003 Elsevier Ltd. All rights reserved.