Provided is a compound represented by formula (I) or a pharmacologically acceptable salt thereof:
wherein L1 is an optionally substituted C1-6 alkylene group or the like, L2 is a single bond or the like, L3 is a single bond or the like, R1, R2, and R3 are each independently an optionally substituted C1-4 alkyl group or the like, R4 is a hydrogen atom or the like, and R5 is a hydrogen atom or the like.
Novel Synthesis of 4-Carboxymethyl 5-Alkyl/Aryl Oxazolidin-2-ones by Rearrangement of 2-Carboxymethyl 3-Alkyl/Aryl <i>N</i>-<i>tert</i>-Butoxycarbonyl Aziridines
作者:Claudia Tomasini、Andrea Vecchione
DOI:10.1021/ol991225l
日期:1999.12.1
A two-step approach for the diastereoselective synthesis of 4-carboxymethyl 5-alkyl/aryl oxazolidin-2-ones is described, which proceeds via the intermediate formation of a carboxymethyl 3-alkyl/aryl N-tert-butoxycarbonyl (N-Boc) aziridines. By reaction of N-Boc p-amino methyl esters with LiHMDS and iodine, trans 2,3-disubstituted N-Boc aziridines are obtained with high stereoselectivities and yields. The final rearrangement to oxazolidin-2-ones is achieved by treatment with a catalytic amount of a Lewis acid and proceeds with high yield and complete regio and stereoselectivity.
[EN] PHARMACEUTICAL COMPOSITION FOR TREATMENT OR PREVENTION OF ATOPIC DERMATITIS<br/>[FR] COMPOSITION PHARMACEUTIQUE POUR LE TRAITEMENT OU LA PRÉVENTION DE LA DERMATITE ATOPIQUE<br/>[JA] アトピー性皮膚炎の治療または予防のための医薬組成物
[EN] SUBSTITUTED DIHYDROPYRROLOPYRAZOLE COMPOUND, AND PHARMACEUTICAL COMPOSITION FOR DOSING IN COMBINATION WITH OTHER PSORIASIS TREATMENT DRUG<br/>[FR] COMPOSÉ DE DIHYDROPYRROLOPYRAZOLE SUBSTITUÉ ET COMPOSITION PHARMACEUTIQUE POUR ADMINISTRATION EN COMBINAISON AVEC UN AUTRE MÉDICAMENT DE TRAITEMENT DU PSORIASIS<br/>[JA] 置換ジヒドロピロロピラゾール化合物および他の乾癬治療薬が組み合わせて投与される医薬組成物