Cp<sub>2</sub>TiCl<sub>2</sub>-Catalyzed Regioselective Hydrocarboxylation of Alkenes with CO<sub>2</sub>
作者:Peng Shao、Sheng Wang、Chao Chen、Chanjuan Xi
DOI:10.1021/acs.orglett.6b00665
日期:2016.5.6
Cp2TiCl2-catalyzed regioselective hydrocarboxylation of alkenes with CO2 to give carboxylic acids in high yields has been developed in the presence of iPrMgCl. The reaction proceeds with a wide range of alkenes under mild conditions. Styrene and its derivatives can transform to α-aryl carboxylic acids, and aliphatic alkenes can transform to form alkanoic acids.
[EN] A PROCESS FOR THE PREPARATION OF ACYLPHOSPHANES<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION D'ACYLPHOSPHANES
申请人:ETH ZÜRICH
公开号:WO2014053455A1
公开(公告)日:2014-04-10
The present invention relates to a versatile, highly efficient process for the preparation of mono- and bisacylphosphanes as well as for their corresponding oxides or sulfides. The invention further relates to novel photoinitiators obtainable by said process.
Processes for producing optically active 2-amino-1-phenylethanol derivatives
申请人:Daicel Chemical Industries, Ltd.
公开号:US20030143701A1
公开(公告)日:2003-07-31
An (R)-2-amino-1-phenylethanol derivative shown by the general formula (IIa)
1
wherein R
1
and R
5
represent a hydrogen atom, etc.; R
2
, R
3
and R
4
independently represent a halogen atom, etc., or a salt thereof, can readily be produced (1) by permitting a microorganism belonging to the genus Rhodosporidium, the genus Comamonas or the like to act on a mixture of corresponding (R)-form and (S)-form to asymmetrically utilize, or (2) by permitting a microorganism belonging to the genus Lodderomyces, the genus Pilimelia or the like to act on a corresponding aminoketone derivative to asymmetrically reduce. An (R,R)-1-phenyl-2-[(2-phenyl-1-alkylethyl)amino]ethanol derivative having a high optical purity can easily be obtained from the compound of the formula (IIa) or a salt thereof. Said derivative is useful as an intermediate for producing an anti-obesity agent and so on.
Betamimetics with a prolonged duration of activity, processes for preparing them, and their use as pharmaceutical compositions
申请人:Buettner Frank
公开号:US20050234134A1
公开(公告)日:2005-10-20
A compound of formula 1
wherein: R
1
is C
1
-C
4
-alkyl; R
2
is C
1
-C
4
-alkyl; and R
3
is C
1
-C
4
-alkyl or phenyl, each optionally mono- or polysubstituted, or R
2
and R
3
together are —CH
2
—CH
2
— or —CH
2
—CH
2
—CH
2
—, or the corresponding acid addition salt with a pharmacologically acceptable acid, processes for preparing such compounds, pharmaceutical compositions containing such compounds, and their use in the treatment of inflammatory and obstructive respiratory diseases.
The present invention provides a process for the preparation of mono- and bisacylphosphanes based on formula (I):
as well as for their corresponding oxides or sulfides. The present invention further relates to photoinitiators obtainable by said process.