Chiral catalyst, process for preparing the same and its use in the oxidate coupling of naphthols
申请人:Gong Liuzhu
公开号:US20050256345A1
公开(公告)日:2005-11-17
The compound of this invention is a useful catalyst for the oxidative coupling of naphthol. Its originality lies in that it is a novel vanadium complex of Schiff's base formed by a chiral amino acid and a formyl biphenol or its derivative. Its axis chirality is induced to form by the chiral amino acid. It has the general formula:
where R represents a benzyl, an isopropyl, an isobutyl or a tertiary butyl and the configuration of the amino acid is R or S. The compound can catalyze oxidative coupling of naphthol or its derivative to form binaphthol or its derivatives with a high optical purity.
Highly Enantioselective Oxidative Couplings of 2-Naphthols Catalyzed by Chiral Bimetallic Oxovanadium Complexes with Either Oxygen or Air as Oxidant
作者:Qi-Xiang Guo、Zhi-Jun Wu、Zhi-Bin Luo、Quan-Zhong Liu、Jian-Liang Ye、Shi-Wei Luo、Lin-Feng Cun、Liu-Zhu Gong
DOI:10.1021/ja074322f
日期:2007.11.1
L-isoleucine and H8-binaphthol is highlyefficient at catalyzing the air-oxidized coupling of 2-naphthols with excellent enantioselectivities of up to 97% ee. 51V NMR study shows that the oxovanadium complexes have two vanadium(V) species. Kinetic studies, the cross-coupling reaction, and HRMS spectral studies on the reaction have been carried out and illustrate that two vanadium(V) species are both involved
Antihypertensive phosphate derivatives having the following formula are described: ##STR1## wherein X is selected from the group consisting of a phenyl radical substituted at any position with a C.sub.1 -C.sub.20 branched or straight chain alkoxy or benzyloxy and optionally substituted by any other positions with one or more groups consisting of C.sub.1 -C.sub.15 branched or straight chain alkyl, C.sub.1 -C.sub.15 branched or straight chain alkoxy and halogen, and a naphthalene radical substituted at any position with a C.sub.1 -C.sub.20 branched or straight chain alkoxy or benzyloxy and optionally substituted at any other positions with one or more groups consisting of C.sub.1 -C.sub.15 branched or straight chain alkyl, C.sub.1 -C.sub.15 branched or straight chain alkoxy and halogen; T is selected from the group consisting of hydrogen and ##STR2## wherein R.sub.1 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.4 branched or straight chain alkyl, C.sub.1 -C.sub.4 branched or straight chain alkoxy and C.sub.1 -C.sub.4 branched or straight chain alkylamino; Y is selected from the group of bivalent radicals consisting of --(CH.sub.2).sub.p -- and --(CHR).sub.p --, wherein p is an integer from 2 to 10 and the moiety --(CHR).sub.p -- represents an alkylene chain substituted with one or more C.sub.1 -C.sub.8 alkyl groups or phenyl groups; Z is selected from the group consisting of --N.sup.+ (R.sub.2).sub.3 and ##STR3## wherein q is an integer from 4-7 and R.sub.2 may be the same or different and is selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 branched or straight chain alkyl.