Suzuki–Miyaura Cross-Coupling of Potassium Alkoxyethyltrifluoroborates: Access to Aryl/Heteroarylethyloxy Motifs
摘要:
The introduction of an alkoxyethyl moiety onto aromatic substructures has remained a long-standing challenge for synthetic organic chemists. The main reasons are the inherent instability of alkoxyethylmetallic species and the lack of general procedures to access them. A new method utilizing a cross-coupling strategy based on the exceptional properties of organotrifluoroborates has been developed, and the method allows an easy and efficient installation of this unit on a broad range of aryl and heteroaryl bromides.
A fast and practical approach to tetrahydropyranylation and depyranylation of alcohols using indium triflate
作者:Tomoko Mineno
DOI:10.1016/s0040-4039(02)01864-6
日期:2002.10
Indium triflate-mediated tetrahydropyranylation of alcohols in dichloromethane and depyranylation of these products in aqueous methanol utilizing the same reagent but different molar ratio is described. In addition, indium triflate-promoted conversion of tetrahydropyran ethers to their corresponding acetates has also been described. (C) 2002 Elsevier Science Ltd. All rights reserved.
ZrCl4 as a mild and efficient catalyst for the one-pot conversion of TBS and THP ethers to acetates
作者:Ch.Sanjeeva Reddy、G Smitha、S Chandrasekhar
DOI:10.1016/s0040-4039(03)01078-5
日期:2003.6
A mild, efficient and chemoselective method has been developed for the direct transformation of tert-butyldimethylsilyl and tetrahydropyranyl protected alcohols into the corresponding acetates with acetic anhydride and zirconium(IV) chloride as the catalyst in acetonitrile, in a one-pot reaction with high yields and short reaction times. This method has been applied to a variety of substrates. (C) 2003 Elsevier Science Ltd. All rights reserved.