Automatic assembly of framework structures. 1. Synthesis, stereochemistry, and cyclization of derivatives of ?,??-dihydroxy-?,??-dimethyl- and ?-methyl-??-ethylglutaric acids
The present invention provides a novel antimicrobial drug comprising an oxazolidinone derivative of the formula (I):
or a pharmaceutically acceptable salt or solvate thereof; wherein ring A is
ring B is a benzene ring optionally substituted with lower alkyl; ring C is an optionally substituted six-membered heterocycle containing at least one nitrogen atom and one to three double bond(s) in the ling wherein the atom at the point of attachment to ring B is a carbon atom; ring D is an optionally substituted five-membered ring containing one or two double bond(s) in the ring; A
1
and A
2
are independently nitrogen or carbon; m is 0 or 1; R represents H, —NHC(═O)R
A
, —NHC(═S)R
A
, —NH-het
1
, —O-het
1
, —S-het
1
, —S(═O)-het
1
, —S(═O)
2
-het
1
, het
2
, —CONHR
A
, —OH, lower alkyl, lower alkoxy or lower alkenyl; and het
1
and het
2
are independently a heterocyclic group; with the proviso that the fused ring C-D is not
The present invention relates to a fused ring-containing oxazolidinone compound shown by general formula (I), a pharmaceutically acceptable salt thereof and a stereoisomer thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, A, B and C are as defined in the description. The present invention further relates to a method for preparing the compound, a pharmaceutical composition and a pharmaceutical formulation comprising the compound, and a use of the compound for the manufacture of a medicament for the treatment and/or prevention of infectious diseases and a use for the treatment and/or prevention of infectious diseases.
Asymmetric Olefin Isomerization of Butenolides via Proton Transfer Catalysis by an Organic Molecule
作者:Yongwei Wu、Ravi P. Singh、Li Deng
DOI:10.1021/ja205674x
日期:2011.8.17
general olefin isomerization was realized via biomimetic protontransfer catalysis with a new chiral organic catalyst. A broad range of mono- and disubstituted β,γ-unsaturated butenolides were transformed into the corresponding chiral α,β-unsaturated butenolides in high enantioselectivity and yield in the presence of as low as 0.5 mol % catalyst. Mechanistic studies have revealed the protonation as the
A convenient method for lactonization of α-allyl esters using iodine in dimethyl- sulphoxide
作者:B. R. Nawghare、S. V. Gaikwad、B. V. Pawar、P. D. Lokhande
DOI:10.4314/bcse.v28i3.16
日期:——
A simple method for the synthesis of α-γ-disubstituted-γ-butyrolactones by cyclization of α-allyl esters using iodine in dimethylsulphoxide is reported. This method is efficient and operationally simple in comparison to methods using transition metal complexes.
[3+2] Cycloaddition methodology provides a general and efficient access to 5-alkyl substituted 2(5H)furanones. The syntheticapproach has been exploited towards the synthesis of naturally occurring butenolides.