Synthesis of gadolinium (±)-10-(1-hydroxypropan-2-yl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyltriacetate via tribenzyl 1,4,7,10-tetraazacyclododecane-1,4,7-tricarboxylate
摘要:
The synthesis of monogadolinium 10-(1-hydroxypropan-2-yl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyltriacetate 12 has been achieved through a multistep sequence. The key step in the synthesis was the reaction of the previously unknown tribenzyl 1,4,7,10-tetraazacyclododecane-1,4,7-tricarboxylate 6 with ethyl 2-(trifluoromethylsulphonyloxy)propionate 4 to give 7. Reduction of 7 with LiBH4/9-OMe-BBN, followed by hydrogenolysis of the protecting groups (Z groups) yielded 2-(1,4,7,10-tetraazacyclododec-1-yl)propanol 10. The monosubstituted macrocycle 10 was alkylated with bromoacetic acid and then complexed with gadolinium oxide to yield the title compound.
Synthesis of gadolinium (±)-10-(1-hydroxypropan-2-yl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyltriacetate via tribenzyl 1,4,7,10-tetraazacyclododecane-1,4,7-tricarboxylate
摘要:
The synthesis of monogadolinium 10-(1-hydroxypropan-2-yl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyltriacetate 12 has been achieved through a multistep sequence. The key step in the synthesis was the reaction of the previously unknown tribenzyl 1,4,7,10-tetraazacyclododecane-1,4,7-tricarboxylate 6 with ethyl 2-(trifluoromethylsulphonyloxy)propionate 4 to give 7. Reduction of 7 with LiBH4/9-OMe-BBN, followed by hydrogenolysis of the protecting groups (Z groups) yielded 2-(1,4,7,10-tetraazacyclododec-1-yl)propanol 10. The monosubstituted macrocycle 10 was alkylated with bromoacetic acid and then complexed with gadolinium oxide to yield the title compound.
[DE] TRIMERE MAKROCYCLISCH SUBSTITUIERTE BENZOLDERIVATE<br/>[EN] TRIMERIC MACROCYCLICALLY SUBSTITUTED BENZENE DERIVATIVES<br/>[FR] DERIVES DE BENZENE TRIMERES SUBSTITUES DE MANIERE MACROCYCLIQUE
申请人:SCHERING AG
公开号:WO2004074267A1
公开(公告)日:2004-09-02
Die Metallkomplexe der allgemeinen Formel (I), worin Hal für Brom oder Iod steht und A1 und A2 unterschiedliche Bedeutung haben, sind als Kontrastmittel geeignet.
The metal complexes of general formula I
1
in which Hal stands for bromine or iodine and A
1
and A
2
have different meanings, are suitable as contrast media.
Die Metallkomplexe der allgemeinen Formel I worin Hal für Brom oder Iod steht und A1 und A2 unterschiedliche Bedeutung haben sind als Kontrastmittel geeignet.
The metal complexes of general formula I
in which Hal stands for bromine or iodine, and A
1
and A
2
have different meanings, are suitable as contrast media.