HBF<sub>4</sub>-Catalysed Nucleophilic Substitutions of Propargylic Alcohols
作者:Elena Barreiro、Alvaro Sanz-Vidal、Eric Tan、Shing-Hing Lau、Tom D. Sheppard、Silvia Díez-González
DOI:10.1002/ejoc.201501249
日期:2015.12
The activity of HBF4 (aqueous solution) as a catalyst in propargylation reactions is presented. Diverse types of nucleophiles were employed in order to form new C–O, C–N and C–C bonds in technical acetone and in air. Good to excellent yields and good chemoselectivities were obtained using low acid loading (typically 1 mol-%) under simple reaction conditions.
Practical and Highly Selective CH Functionalization of Structurally Diverse Ethers
作者:Miao Wan、Zhilin Meng、Hongxiang Lou、Lei Liu
DOI:10.1002/anie.201407083
日期:2014.12.8
A trityl ion mediated CHfunctionalization of ethers with a wide range of nucleophiles at ambient temperature has been developed. The reaction displays high chemoselectivity and good functional group tolerance. The protocol also exhibits excellent regio‐ and diastereoselectivities for the unsymmetric ethers, thus stereoselectively generating highlyfunctionalized disubstituted 2,5‐trans tetrahydrofurans
Synthesis of propargylic ethers via Lewis-acid mediated nucleophilic substitution of propargylic esters
作者:A. Bartels、R. Mahrwald、S. Quint
DOI:10.1016/s0040-4039(99)01250-2
日期:1999.8
Direct displacement of propargylic esters is reported. 10 mol% of TiCl4 were used to carry out this novel, nucleophilic substitution. (C) 1999 Elsevier Science Ltd. All rights reserved.
Ti(OiPr)4-Mediated nucleophilic substitution of propargylic esters
作者:R Mahrwald、S Quint、S Scholtis
DOI:10.1016/s0040-4020(02)01286-3
日期:2002.12
The direct and catalytic displacement reactions of propargylic esters are reported. The reaction is based on the Ti(OR)(4)/alpha-hydroxy acid mediated ligand exchange. This methodology enables the inclusion of a broad range of acetylenes and aldehydes into this substitution reaction. (C) 2002 Elsevier Science Ltd. All rights reserved.