Expeditious N-monoalkylation of 1,4,7,10-tetraazacyclododecane (cyclen) via formamido protection
摘要:
The reaction of cyclen 1 with chloral hydrate afforded exclusively 1,4,7-triformylcyclen 2 in high yield; the triprotected macrocycle was easily alkylated with various electrophiles in good to excellent yields. The alkaline removal of the formyl groups provided a selective entry into N-monosubstituted cyclen derivatives. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of Lipophilic Paramagnetic Contrast Agents
作者:William C. Baker、Michael J. Choi、Daniel C. Hill、Julie L. Thompson、Peter A. Petillo
DOI:10.1021/jo981920r
日期:1999.4.1
The facile, high-yielding synthesis of a series of macrocycles 7a-k in 75-100% yield is reported. The transformation of these compounds to their carboxymethylated analogues 8a-k in 75-90% yield and subsequent gadolinium complexes 9a-k provides a series of homologous neutral paramagnetic contrast agents (PCAs) with tunable lipophilicity. Alkylated cationic intermediates 6a-k are prepared in yields of 72-94% from glyoxal adduct of cyclen (5) and slight excesses of alkyl iodides. The methodology is selective for monoalkylation and amenable to large-scale synthesis.
Stoichiometric mono N-functionalization of cyclen via a boron protected intermediate
作者:F Chuburu、M Le Baccon、H Handel
DOI:10.1016/s0040-4020(01)00115-6
日期:2001.3
The temporary triprotection of cyclen by a boron atom performed in presence of sodium hydride offers a convenient solution for the mono N-alkylation of cyclen. Examples of mono N-alkylated cyclens and bis-cyclens are reported. (C) 2001 Elsevier Science Ltd. All rights reserved.
MACROCYCLIC COMPLEXES, THEIR PROCESS OF PREPARATION AND USE AS PET IMAGING AGENTS
申请人:INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHE MEDICALE (INSERM)
公开号:US20170210714A1
公开(公告)日:2017-07-27
The present invention concerns compounds of formula (I): their process of preparation and compositions thereof. The present invention also concerns their use as diagnostic agent in PET imaging.
Expeditious N-monoalkylation of 1,4,7,10-tetraazacyclododecane (cyclen) via formamido protection
作者:Vincenzo Boldrini、Giovanni B Giovenzana、Roberto Pagliarin、Giovanni Palmisano、Massimo Sisti
DOI:10.1016/s0040-4039(00)01092-3
日期:2000.8
The reaction of cyclen 1 with chloral hydrate afforded exclusively 1,4,7-triformylcyclen 2 in high yield; the triprotected macrocycle was easily alkylated with various electrophiles in good to excellent yields. The alkaline removal of the formyl groups provided a selective entry into N-monosubstituted cyclen derivatives. (C) 2000 Elsevier Science Ltd. All rights reserved.
Cyclen lanthanide-based micellar structures for application as luminescent [Eu(<scp>iii</scp>)] and magnetic [Gd(<scp>iii</scp>)] resonance imaging (MRI) contrast agents
作者:Esther M. Surender、Steve Comby、Sarah Martyn、Brenton Cavanagh、T. Clive Lee、Dermot F. Brougham、Thorfinnur Gunnlaugsson
DOI:10.1039/c6cc03092k
日期:——
Novel Ln(III)-based amphiphilic complexes with potential application as luminescent and MRIcontrastagents, which self-assemble in aqueous solution into spherical micelles, are presented.