Organic metal compound and process for preparing optically-active alcohols using the same
申请人:Miki Takashi
公开号:US20090062573A1
公开(公告)日:2009-03-05
The present invention provides an asymmetric reduction catalyst effective in preparing optically-active alcohol compounds having various functional groups, and a process for preparing optically-active alcohol compounds using said asymmetric reduction catalyst.
The organic metal compound of the present invention is represented by the following general formula (1):
wherein R
1
and R
2
may be mutually identical or different, and are an alkyl group, a phenyl group, a naphthyl group, a cycloalkyl group, or an alicyclic ring formed by binding R
1
and R
2
, which may have a substituent; R
3
is a hydrogen atom or an alkyl group; Cp is a cyclopentadienyl group, which may have a substituent, bound to M
1
via a π bond; X
1
is a halogen atom or a hydrido group; M
1
is rhodium or iridium; and * denotes asymmetric carbon.
Inhibition of urease results in Helicobacter pylori growth arrest in the stomach, promoting urease as promising targets for gastrointestinal ulcer therapy. Twenty hybrid derivatives of flavonoid scaffold and hydroxamic acid, β-hydroxy-β-phenylpropionylhydroxamic acids, were therefore synthesized and evaluated against H. pylori urease. Biological evaluation of these compounds showed improved urease
hemimalonate used. With the unsubstituted substrate, a carboxylic acid intermediate was isolated upon acid quench resulting from the nucleophilic addition of the putative enol carboxylate anion of the hemimalonate to imines/aldehydes before CO2 loss. With substituted hemimalonates, the reaction likely involved an enolate which then added to imines/aldehydes or was competitively protonated. According to the base
Optically active alkyl 3-aryl-3-hydroxypropionates and a method for producing thereof
申请人:CHISSO CORPORATION
公开号:EP0451668A2
公开(公告)日:1991-10-16
The invention relates to optically active alkyl 3-aryl-3-hydroxypropionates represented by the general formula:
wherein R¹, R², R³, R ⁴ and R⁵ are hydrogen, hydroxyl, alkoxy of 1-4 carbon atoms, benzyloxy, flurorine, chlorine or bromine and R⁶ is alkyl,
and a method for producing the above compounds.
Pradefovir: A Prodrug That Targets Adefovir to the Liver for the Treatment of Hepatitis B
作者:K. Raja Reddy、Michael C. Matelich、Bheemarao G. Ugarkar、Jorge E. Gómez-Galeno、Jay DaRe、Kristin Ollis、Zhili Sun、William Craigo、Timothy J. Colby、James M. Fujitaki、Serge H. Boyer、Paul D. van Poelje、Mark D. Erion
DOI:10.1021/jm7012216
日期:2008.2.1
Adefovir dipivoxil, a marketed drug for the treatment of hepatitis B, is dosed at submaximally efficacious doses because of renal toxicity. In an effort to improve the therapeutic index of adefovir, 1-aryl-1,3-propanyl prodrugs were synthesized with the rationale that this selectively liver-activated prodrug class would enhance liver levels of the active metabolite adefovir diphosphate (ADV-DP) and/or decrease kidney exposure. The lead prodrug (14, MB06866, pradefovir), identified from a variety of in vitro and in vivo assays, exhibited good oral bioavailability (F = 42%, mesylate salt, rat) and rate of prodrug conversion to ADV-DP. Tissue distribution studies in the rat using radiolabeled materials showed that cyclic 1-aryl-1,3-propanyl prodrugs enhance the delivery of adefovir and its metabolites to the liver, with pradefovir exhibiting a 12-fold improvement in the liver/kidney ratio over adefovir dipivoxil.