An optimization study for radioiodination of a new synthesized benzamide derivative as an analogue tracer for malignant melanoma imaging
Author:
Kandil Shaban A.1, Aglan Hany2, EL-Kafrawy Ahmed F.3, Seddik Usama2
Affiliation:
1. Cyclotron Project, Nuclear Research Centre, Atomic Energy Authority, B.O. 13759, Cairo, Egypt , Tel.: +2 02 446 91 743, Fax: +2 0246220086 2. Cyclotron Project, Nuclear Research Centre, Atomic Energy Authority, B.O. 13759, Cairo, Egypt 3. Faculty of Science, Ain Shams University, Cairo, Egypt
Abstract
Abstract
Iodobenzamides are reported to possess some affinity for melanoma. This study describes the synthesis of a new benzamide analogue, N-(2-diethylamino-ethyl)-4-(4-chloro-nicotinamido)-5-[125I]iodo-2-methoxybenzamide ([125I]H4) designed to target melanoma. The synthesis was simply achieved in four steps. There were two PyCIU/DIPEA amide condensations and a transfer hydrogenation using an ammonium formate hydrogen donor. The radioiodination step was carried out with 125I via an electrophilic substitution reaction. The reaction conditions were optimized. The labeled compound was purified by HPLC. The maximum radiochemical yield was found to be 78% at a radiochemical purity of 98%. All compounds were characterized by MS and NMR techniques. The log P value for [125I]H4 was found as 3.96±0.5.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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