HYDROXYLATION OF BETA-DICARBONYLS WITH ZIRCONIUM CATALYSTS
申请人:CASALNUOVO ALBERT LOREN
公开号:US20080306259A1
公开(公告)日:2008-12-11
The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by *
comprising contacting a compound of Formula II
with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydropetoxides in the presence of a zirconium complex, wherein R
1
, R
2
and R
3
are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer
wherein J, R
6
and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.
Hydroxylation of Beta-Dicarbonyls with Zirconium Catalysts
申请人:Casalnuovo Albert Loren
公开号:US20100185014A1
公开(公告)日:2010-07-22
The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by *
comprising contacting a compound of Formula II
with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydroperoxides in the presence of a zirconium complex, wherein R
1
, R
2
and R
3
are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer
wherein J, R
6
and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.
Hydroxylation of beta-dicarbonyls with zirconium catalysts
申请人:E.I. du Pont de Nemours and Company
公开号:US07718818B2
公开(公告)日:2010-05-18
The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by *
comprising contacting a compound of Formula II
with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydroperoxides in the presence of a zirconium complex, wherein R1, R2 and R3 are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer
wherein J, R6 and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.
Urotropin synthesis of 3,5-di-tert-butylsalicylic acid derivatives
作者:V. B. Vol’eva、I. S. Belostotskaya、N. L. Komissarova、L. N. Kurkovskaya、A. P. Pleshakova、T. I. Prokofeva
DOI:10.1134/s1070428007100132
日期:2007.10
The stability of 3,5-di-tert-butylsalicylic aldehyde against oxidation is due to autoinhibiting of the chain process. However its oxidation into 3,5-di-tert-butylsalicylic acid was performed at the use of acetyl protection of the hydroxy group. In reaction of 6-bromo-2,4-di-tert-butylphenol with urotropin the formation was discovered of 3,5-di-tert-butylsalicylic acid, its nitrile and amide.
Hydroxylation of β-dicarbonyls with zirconium catalysts
申请人:E. I. du Pont de Nemours and Company
公开号:US07414157B2
公开(公告)日:2008-08-19
The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by comprising contacting a compound of Formula II with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydroperoxides in the presence of a zirconium complex, wherein R1, R2 and R3 are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer wherein J, R6 and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.