Photochemical Rearrangement of <i>N</i>-Chlorolactams: A Route to <i>N</i>-Heterocycles through Concerted Ring Contraction
作者:Dana K. Winter、Alexandre Drouin、Jean Lessard、Claude Spino
DOI:10.1021/jo100181h
日期:2010.4.16
We report a novel ringcontraction allowing the direct conversion of N-chlorolactams to their corresponding ring-contraction N-heterocycles upon photolysis. Results show that the rearrangement occurs with a variety of N-chlorolactams and that the greater the substitution at the migrating carbon, the greater the yield of product. Importantly, stereochemistry at the migrating carbon is conserved in the
Aminoglycoside derivatives, process for their preparation and pharmaceutical compositions
申请人:SHIONOGI & CO., LTD.
公开号:EP0009670A1
公开(公告)日:1980-04-16
Aminoglycoside derivatives of the general formula (I)
are disclosed,
wherein R is hydrogen or acyl:
n is an integer of 1 to 3;
R1 is aminomethyl, hydroxymethyl, 1-aminoethyl, or 1-methylaminoethyl;
R2, R3 and R6 are each hydrogen or hydroxy;
R4 is hydroxy or amino;
R5 is amino or methylamino;
R7 is hydroxy or methyl;
R8 is hydrogen, hydroxymethyl or carbamoylox ymethyl; and the dotted line represents the presence or absence or a double bond, with the proviso that if the dotted line represents a double bond, R5 is methylamino, and their salts with together with a process for their preparation and that maceutical composition having antibiotic activity and containing compounds of the general formula (I)
Pyridine derivative as ASK1 inhibitor and preparation method and use thereof
申请人:FUJIAN COSUNTER PHARMACEUTICAL CO., LTD.
公开号:US11040968B2
公开(公告)日:2021-06-22
Disclosed in the present invention are a compound as shown in formula (II), a tautomer or a pharmaceutically acceptable salt thereof, and also disclosed is the use thereof in preparing a drug for treating an ASK1-associated disease.
The enantioselective synthesis of 3-hydroxypyrrolidin-2-ones and 3-hydroxy piperidin-2-ones has been carried out in high enantiomeric excess employing immobilized lipase from Pseudomonas cepacia. (C) 2003 Elsevier Ltd. All rights reserved.