A novel no-carrier-added submicromolar scale radiosynthesis of [<i>S</i>-methyl-<sup>14</sup>C]-florfenicol
作者:G. Srinivas、G. Prabhakar、V. K. P. Unny、K. Sudhakar、K. Mukkanti、B. M. Choudary
DOI:10.1002/jlcr.3053
日期:2013.6.30
In this paper is reported a novel reaction scheme for the no-carrier-added submicromolar scale radiosynthesis of [S-methyl-14C]-florfenicol that has been newly designed, developed and employed by us successfully. The [14C]-product was obtained in an overall radiochemical yield of 30% based on [14C]-methyl iodide taken for the reaction with a radiochemical purity of more than 96%. The specific activity of the product was ~50 mCi (1.85 GBq)/mmol. Chlorosulfonation of compound I was followed by sodium salt formation in situ and it was succeeded by the introduction of [14C]-methyl group by coupling with [14C]-CH3I. Subsequently, the oxazolidin-2-one protecting group was opened up by a reaction with sulfuric acid in dioxane and later, the amino group was dichloroacetylated with methyl-2,2-dichloroacetate in triethylamine to obtain [S-methyl-14C]-florfenicol.
本文报道了我们新设计、开发并成功应用的一种无载体亚微摩尔级放射合成[S-甲基-14C]-氟苯尼考的新反应方案。以用于反应的[ 14 C]-碘甲烷计,获得的[ 14 C]-产物的总放射化学收率为30%,放射化学纯度大于96%。产物的比活度约为50mCi (1.85GBq)/mmol。化合物I氯磺化后原位形成钠盐,并通过与[ 14 C]-CH 3 I偶联引入[ 14 C]-甲基。随后,在二恶烷中与硫酸反应打开恶唑烷-2-酮保护基,然后在三乙胺中用2,2-二氯乙酸甲酯对氨基进行二氯乙酰化,得到[S-甲基-14C]-氟苯尼考。