Two new efficient preparations of enantiopure 2,2′-dihydroxy-6,6′-dimethoxy-1,1′-biphenyl
摘要:
Two new useful methods for the preparation of diol 1 starting from available compounds are described. Separation of the two enantiomers entails resolution of racemic diol 1 via the corresponding diastereomeric N-methylated phosphorothioamidates. Their separation by recrystallization followed by reduction afforded diol (aS)-1 and (aR)-1 in 100% and 72% ee, respectively. (C) 1997 Elsevier Science Ltd.
Room‐Temperature Ionic Liquid–Promoted Williamson's Synthesis of Ethers: A Facile Synthesis of Diaryloxymethanes
作者:S. V. More、S. S. Ardhapure、N. H. Naik、S. R. Bhusare、W. N. Jadhav、R. P. Pawar
DOI:10.1080/00397910500281267
日期:2005.12.1
A simple and efficient method has been developed for the synthesis of phenolic ethers using room-temperature ionic liquid, not only as solvent but also as promoter. Ionic liquid was recycled and subsequently reused without any loss of the product.
CCXL.—Cyclic esters of sulphuric acid. Part I. The reactions of methylene sulphate
作者:Wilson Baker
DOI:10.1039/jr9310001765
日期:——
Preparation and resolution of 2,2′-dimercapto-6,6′-dimethoxy-1,1′-biphenyl: a C2-symmetric sulfur building block
The preparation of the title dimercaptan 1 starting from 2,2'-dihydroxy-6,6'-dimethoxy-1,1'-biphenyl 2 is described, Resolution of dimercaptan 1 was performed using (-)-(1R,2S,5R)-menthyl chloroformate as a chiral resolving agent. The procedure affords dimercaptan (+)-1 and (-)-1 in 98% ee and 93% ee, respectively. A new and direct intermolecular Ullmann coupling resulting in an improved preparation of diol 2 is also reported. (C) 1998 Elsevier Science Ltd. All rights reserved.
US4299636A
申请人:——
公开号:US4299636A
公开(公告)日:1981-11-10
Practical Synthesis of Diaryloxymethanes
作者:Wenming Liu、Joanna Szewczyk、Liladhar Waykole、Oljan Repič、Thomas J. Blacklock
DOI:10.1081/scc-120021995
日期:2003.1.8
Diaryloxymethanes were prepared by treating phenols with sodium hydride and dichloromethane in N-methyl-pyrrolidinone (NMP) at 40degreesC.