Titanium superoxide – a stable recyclable heterogeneous catalyst for oxidative esterification of aldehydes with alkylarenes or alcohols using TBHP as an oxidant
作者:Soumen Dey、Sunita K. Gadakh、A. Sudalai
DOI:10.1039/c5ob01586c
日期:——
A single step catalytic approach for the synthesis of esters from aldehydes using a recyclable heterogeneous catalyst is described.
To explore further the practical uses of highly active manganese (Mn*), a variety of alcohols were treated with Mn*, and the resulting complexes were coupled with acid chlorides and/or acetic anhydride in the absence of any extra catalyst. The subsequent reactions took place smoothly under mild conditions, providing the corresponding O-acylation products in good to excellent isolated yields.
Reusable ionic liquid-catalyzed oxidative esterification of carboxylic acids with benzylic hydrocarbons via benzylic Csp<sup>3</sup>–H bond activation under metal-free conditions
作者:Fen Mou、Yadong Sun、Weiwei Jin、Yonghong Zhang、Bin Wang、Zhiqing Liu、Lei Guo、Jianbin Huang、Chenjiang Liu
DOI:10.1039/c7ra02788e
日期:——
A metal-free protocol for the direct oxidativeesterification of the Csp3–H bond in benzylic hydrocarbons with carboxylic acids using heterocyclic ionic liquid as catalyst has been reported. The catalyst 1-butylpyridinium iodide could be easily recycled and reused for at least four cycles without obvious loss of catalytic activity.
Purinenucleoside derivative modified in 8-position and medical use thereof
申请人:Tatani Kazuya
公开号:US20070179115A1
公开(公告)日:2007-08-02
The present invention provides an 8-modified purinenucleoside derivative which is useful for diseases associated with an abnormality of plasma uric acid level. An 8-modified purinenucleoside derivative represented by the following formula (I), a prodrug thereof or a pharmaceutically acceptable salt thereof, or a hydrate or solvate thereof, is useful for the prevention or treatment of gout, hyperuricemia, urinary lithiasis, hyperuricemic nephropathy or the like.
In the formula, n is 1 or 2; R
A
is a hydrogen atom or a hydroxyl group; R
1
is a hydrogen atom, a hydroxyl group, a thiol group, an amino group or a chlorine atom; ring J represents an optionally substituted 2-naphthyl group, or a group represented by the following general formula (II) wherein Y represents a single bond or a connecting group; ring Z represents an optionally substituted aryl group or heteroaryl group or the like; and R
2
to R
4
, P
1
and Q represents a halogen atom, a cyano group or the like.