A novel modification of the Ritter reaction using trimethylsilyl cyanide
作者:H.G. Chen、O.P. Goel、S. Kesten、J. Knobelsdorf
DOI:10.1016/0040-4039(96)01890-4
日期:1996.11
A new modification of the Ritter reaction using trimethylsilylcyanide (Me3SiCN) is described, which converts alcohols to their corresponding formamides in high yields using a convenient procedure. The reaction conditions and mechanism are discussed. In some cases, new formamides are synthesized which cannot be prepared by the classical Ritter reaction.
1
The present invention relates to a novel fatty acid derivative of formula (I), wherein R
1
is acyl group; R
2
is acyl(lower)alkyl; R
3
is hydrogen, aryl(lower)alkyl, etc.; R
4
is acyl(lower)alkyl; and X is —O—, —NH— or formula (II) [wherein R
5
is lower alkyl, etc.]; and a pharmaceutically acceptable salt thereof, which is useful as a medicament; the processes for the preparation of said fatty acid derivative or a salt thereof; a pharmaceutical composition comprising said fatty acid derivative or a pharmaceutically acceptable salt thereof; etc.
[EN] DIHYDROOXAZINE OR OXAZEPINE DERIVATIVES HAVING BACE1 INHIBITORY ACTIVITY<br/>[FR] DÉRIVÉS DE DIHYDROOXAZINE OU D'OXAZÉPINE AYANT UNE ACTIVITÉ INHIBITRICE DE BACE1
申请人:SHIONOGI & CO
公开号:WO2014065434A1
公开(公告)日:2014-05-01
The present invention provides a compound which has an effect of inhibiting amyloid beta production, especially an effect of inhibiting BACE1, and which is useful as a therapeutic or prophylactic agent for diseases induced by production, secretion and/or deposition of amyloid beta proteins. A compound of the formula (I):wherein X is -C(R3a)(R3b)-, -C(R3a)(R3b)-C(R3c)(R3d)- or -C(R3a)=C(R3c)-, R1 is substituted or unsubstituted alkyl or the like,R2a, R2b, R3a, R3b, R3c and R3d are each independently hydrogen, halogen or the like, R4 is hydrogen or halogen,Ring B is substituted or unsubstituted carbocycle or a substituted or unsubstituted heterocycle, or a pharmaceutically acceptable salt thereof.
Zinc chloride homogeneous catalysis in the tritylation of hydroxyl- and amide-bearing molecules
作者:Maurizio Maltese、Maria Cecilia Vergari、Maria Pia Donzello
DOI:10.1016/j.tetlet.2010.11.095
日期:2011.1
A tritylation protocol based on the transfer of the triphenylmethylcarbenium ion from trityl acetate to substrates having hydroxyls, in the presence of catalytic amounts of ZnCl2, is described. The advantages of this method are broad scope, mild conditions, and easy handling. The comparison with the procedure based on the use of equimolar mixture of TrCl and ZnCl2 in the presence of TEA shows that
[EN] DIHYDROTHIAZINE DERIVATIVES<br/>[FR] DÉRIVÉS DE DIHYDROTHIAZINE
申请人:SHIONOGI & CO
公开号:WO2017061534A1
公开(公告)日:2017-04-13
The present invention provides a compound which has an effect of inhibiting amyloid β production, especially an effect of inhibiting BACE1, and which is useful as a therapeutic or prophylactic agent for diseases induced by production, secretion and/or deposition of amyloid β proteins. A compound of formula (I) wherein R1 is alkyl or haloalkyl, R2 is H or halogen, R3 is H, alkyl, alkyloxyalkyl or haloalkyl optionally substituted with cycloalkyl, R4 is H or halogen, -X= is -CH= or -N=, ring B is a substituted or unsubstituted aromatic carbocycle, a substituted or unsubstituted aromatic heterocycle or the like, or a pharmaceutically acceptable salt thereof.