Process for the preparation of 3-hydroxytetrahydrofuran
申请人:Kaneka Corporation
公开号:US06359155B1
公开(公告)日:2002-03-19
An industrial advantage process for producing high-purity 3-hydroxytetrahydrofuran easily and simply,
which comprises reducing a 4-halo-3-hydroxybutyric acid ester (1) with a boron hydride compound and/or an aluminum hydride compound as a reducing agent in an organic solvent immiscible with water;
treating the reaction mixture with an acid and water to thereby effect conversion to the corresponding 4-halo-1,3-butanediol and at the same time giving an aqueous solution containing said compound;
carrying out the cyclization reaction of the 4-halo-1,3-butanediol in said aqueous solution;
extracting the resulting 3-hydroxytetrahydrofuran from the 3-hydroxytetrahydrofuran-containing aqueous solution using an organic solvent immiscible with water; and
isolating the 3-hydroxytetrahydrofuran by concentration and/or distillation of the solution obtained.
Practical Syntheses of (S)-4-Hydroxytetrahydrofuran-2-one, (S)-3-Hydroxytetrahydrofuran and Their (R)-Enantiomers
作者:Yoshifumi Yuasa、Haruki Tsuruta
DOI:10.1002/jlac.199719970911
日期:1997.9
Optically active 4-hydroxytetrahydrofuran-2-one (3) has been synthesized in good yield from optically active ethyl 4-chloro-3-hydroxybutanoate (2) by refluxing with dilute hydrochloric acid. In a similar manner, optically active 3-hydroxytetrahydrofuran (5) was prepared from optically active 4-chloro-1,3-butanediol (4), which was derived from 2 by NaBH4 reduction. These new cyclizations proceed without
Parallel Kinetic Resolution of Unsymmetrical Acyclic Aliphatic <i>syn</i>-1,3-Diols
作者:Hui Yang、Wen-Hua Zheng
DOI:10.1021/acs.orglett.9b01801
日期:2019.7.5
catalytic parallelkineticresolution of unsymmetrical acyclic aliphatic syn-1,3-diol derived acetals mediated by chiral phosphoric acid. This method provides stereoselective access to a variety of syn-1,3-diols as valuable building blocks with high enantioselectivity. Moreover, this mild system allows for site-selective protection of optically pure syn-1,3-diols in excellent regioselectivity.
Oxidative esterification of primary alcohols with TEMPO/CaCl 2 /Oxone under hydrous conditions
作者:Sven Hackbusch、Andreas H. Franz
DOI:10.1016/j.tetlet.2016.05.066
日期:2016.6
Symmetric esters are important compounds in the chemical industry, which creates demand for simple and efficient synthetic routes. Oxidative esterification is a promising method to achieve these aims. Here, we show that TEMPO/CaCl2/Oxone forms a convenient catalytic system for the synthesis of the aforementioned symmetric esters from primary alcohols in a biphasic dichloromethane–water solvent mixture. The