Chiral Epoxides via Borane Reduction of 2-Haloketones Catalyzed by Spiroborate Ester: Application to the Synthesis of Optically Pure 1,2-Hydroxy Ethers and 1,2-Azido Alcohols
作者:Kun Huang、Haiyang Wang、Viatcheslav Stepanenko、Melvin De Jesús、Carilyn Torruellas、Wildeliz Correa、Margarita Ortiz-Marciales
DOI:10.1021/jo102294j
日期:2011.3.18
with 10% spiroaminoborate ester 1 as catalyst is described. By a simple basic workup of 2-halohydrins, optically active epoxides are obtained in high yield and with excellent enantiopurity (up to 99% ee). Ring-opening of oxiranes with phenoxides or sodium azide is investigated under different reaction conditions affording nonracemic 1,2-hydroxy ethers and 1,2-azido alcohols with excellent enantioselectivity
Highly Regioselective Ring Opening of Oxiranes with Phenoxides in the Presence of β-Cyclodextrin in Water
作者:K. Surendra、N. Srilakshmi Krishnaveni、Y. V. D. Nageswar、K. Rama Rao
DOI:10.1021/jo034194n
日期:2003.6.1
Highly regioselectiveringopening of oxiranes to beta-hydroxy ethers with phenoxides has been achieved in impressive yields in the presence of beta-cyclodextrin as catalyst and water as solvent.
A catalyst-free regio- and stereoselective ring-opening of epoxides with phenoxides has been carried out efficiently using polyethyleneglycol as the reaction medium to form the corresponding β-aryloxyalcohols in high yields at room temperature.
Highly Regioselective Ring Opening of Epoxides with Polymer Supported Phenoxide and Naphthoxide Anions
作者:B. Tamami、N. Iranpoor、R. Rezaei
DOI:10.1081/scc-200026220
日期:2004.1
Abstract Amberlite IRA‐400 supported phenoxide and naphthoxide anions are easily prepared. These polymer supported reagents that are highly air stable are used for the regioselective ringopening reactions of different epoxides to give aryl ether alcohols in high yields under mild reaction conditions.
Complex catalyst, process for producing the complex catalyst, and process for producing alchohol derivative with the complex catalyst
申请人:——
公开号:US20040077487A1
公开(公告)日:2004-04-22
There are provided (asymmetric) complex catalysts comprising metal complexes and Lewis acids as components, the metal complex being of formula (1):
1
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
and R
8
are the same or different and are independently hydrogen, halogen, alkyl or the like; one of R
9
and R
10
is hydrogen and the other is alkyl of 1 to 4 carbon atoms or the like; Q is a single bond or alkylene of 1 to 4 carbon atoms; M is a metal ion; and A is a balancing counter ion or ligand; processes for the production of these complex catalysts; processes for the production of (optically active) alcohol derivatives, characterized in that cyclic ether compounds are reacted with phenol derivatives in the presence of these complex catalysts; and further processes for producing (optically active) nitrogen-containing heterocyclic compounds by reacting these alcohol derivatives with halogenated nitrogen-containing heterocyclic compounds in the presence of a base.