Tetracyclines. 10. Chemical-structural properties of tetracycline derivatives. 5. A total synthesis and structural aspects of racemic 8-oxygenated tetracyclines
Highly enantioselective catalytic hydrogenation of a 5-amino-3,5-dioxopentanoic ester
摘要:
The highly enantioselective hydrogenation of methyl 4-tert-butylcarbamoyl-3-oxo-butyrate to the corresponding secondary alcohol, representing an interesting chiral building block, for example, for the synthesis of statins, has been investigated in the presence of homogeneous chiral Rh(I) and Ru(II) complexes bearing phosphine ligands. The highest enantioselectivity (up to 96%) was achieved with a [Ru((R)-BINAP)(p-cymene)Cl]Cl complex (sub./cat. ratio 100:1, 5 bar H(2), rt, MeOH). (C) 2008 Elsevier Ltd. All rights reserved.
Amido compounds and process for producing the same
申请人:——
公开号:US20010023297A1
公开(公告)日:2001-09-20
A 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compounds can be produced by reacting a 6-halomethyl-4H-2,3-dioxin-4-one compound with a primary or secondary amine and carbon monoxide. The reaction may be carried out in the presence of a catalyst comprising a platinum group metal. 3-oxopentanedicarboxylic acid monoamides and 3-oxopentanedicarboxylic acid amide esters can be are produced by reacting 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compound with an alcohol or water. Using such intermediates, 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compound, 3-oxopentanedicarboxylic acid amide esters can provide in an easy and simple and efficient manner.
PROCESS FOR PREPARING PENTANOIC DIACID DERIVATIVES
申请人:Boerner Armin
公开号:US20110065920A1
公开(公告)日:2011-03-17
The present invention relates to a process for preparing pentanoic diacid derivatives useful for preparing pyrimidine derivatives, in particular as intermediates useful for preparing pyrimidine derivatives of a class that is effective at inhibiting the biosynthesis of cholesterol in humans, such as HMG-CoA reductase inhibitors, e.g. rosuvastatin.
Process for preparing pentanoic diacid derivatives
申请人:Ratiopharm GmbH
公开号:EP2223909A1
公开(公告)日:2010-09-01
The present invention relates to a process for preparing pentanoic diacid derivatives useful for preparing pyrimidine derivatives, in particular as intermediates useful for preparing pyrimidine derivatives of a class that is effective at inhibiting the biosynthesis of cholesterol in humans, such as HMG-CoA reductase inhibitors, e.g. rosuvastatin.