Cyclododecanone as a recyclable protecting group for the synthesis of highly functionalized 3-amino-2-thiohydantoins from conventional starting materials
A simple and efficient approach has been developed for the synthesis of highly substituted 3-amino-2-thiohydantoins using cyclododecanone as a protecting group and thiosemicarbazide, chloroacetic acid and substituted benzaldehyde as reactants. This high yielding (79–96%) protocol is a milder alternative to the traditional method that uses unprotected thiosemicarbazide. It was identified that the preferred
THORWART, WERNER;GEBERT, ULRICH;SCHLEYERBACH, RUDOLF;BARTLETT, ROBERT
作者:THORWART, WERNER、GEBERT, ULRICH、SCHLEYERBACH, RUDOLF、BARTLETT, ROBERT
DOI:——
日期:——
Imidazo- and triazolothiadiazines
申请人:Hoechst Aktiengesellschaft
公开号:US04891374A1
公开(公告)日:1990-01-02
Novel imidazo- and triazolothiadiazines of the general formula I ##STR1## in which R.sup.1 =C.sub.1 -C.sub.4 -alkyl, R.sup.2 =H or C.sub.1 -C.sub.3 -alkyl and the structural element --A--B--=--CH.sub.2 --CH.sub.2 --, --CH CH--, --CH.dbd.N--, --CH.sub.2 --CO-- or --CO--CH.sub.2 --, and the physiologically aceptable acid-addition salts thereof, are prepared by reacting 2-halo-1-phenylalkanones of the formula II ##STR2## (meaning of R.sup.1 and R.sup.2 as in formula I, X=halogen) with compounds of the formula III ##STR3## (meaning of --A--B-- as in formula I) and, if appropriate, converting the compounds of the formula I formed into the physiologically acceptable acid-addition salts thereof by means of suitable acids. The compounds of the formula I and the physiologically acceptable acid-addition salts thereof are principally suitable for the prevention and treatment of inflammatory--in particular inflammatory rheumatic--disorders. Some of the intermediates formed during the preparation of the compounds of the formula I are also novel, namely 1-amino-2-mercaptoimidazole ##STR4## and 1-amino-2-thioxo-5-imidazolidinone ##STR5##