5-(Hydroxymethyl)thiazole is a versatile building block for many biologically active compounds. A rapid and efficient four-step synthesis of its stable isotope labeled counterpart with four 13C and four deuterium atoms in 32% total yield is reported. Condensation of [13C2]-chloro acetic acid with [13C]-thiourea gave [13C3]-2,4-thiazolidinedione. Reaction of [13C3]-2,4-thiazolidinedione with phosphorus oxybromide and [13C, D]-DMF (Me2N13CDO) produced [13C4, D]-2,4-dibromo-thiazole-5-carboxaldehyde. The resultant aldehyde was then reduced by sodium borodeuteride to [13C4, D2]-(2,4-dibromo-thiazol-5-yl)-methanol. Catalytic deuteration of [13C4, D2]-(2,4-dibromo-thiazol-5-yl)-methanol by palladium black with deuterium gas at 1 atm pressure and room temperature produced completely de-brominated [13C4, D4]-5-(hydroxymethyl)thiazole. De-bromination of the 2,4-dibromothiazole by the catalysis of palladium black provides a simple and convenient synthetic method for the stable isotope labeled and potentially radioactive isotope labeled thiazole compounds. Copyright © 2009 John Wiley & Sons, Ltd.
5-(羟甲基)
噻唑是许多
生物活性化合物的通用构件。本研究通过四个步骤快速高效地合成了含有四个 13C 原子和四个
氘原子的稳定同位素标记对应物,总产率为 32%。13C2]-
氯乙酸与[13C]-
硫脲缩合得到[13C3]-
2,4-噻唑烷二酮。[13C3]-
2,4-噻唑烷二酮与氧
溴化
磷和[13C, D]-
DMF (Me2N13CDO) 反应生成了[13C4, D]-
2,4-二溴-噻唑-5-甲醛。生成的醛随后被
硼氘化钠还原成 [13C4,D2]-(2,4-二
溴-
噻唑-5-基)-
甲醇。在 1 个大气压和室温下,
钯黑用
氘气催化[13C4, D2]-(2,4-二
溴-
噻唑-5-基)-
甲醇脱
氘,生成完全脱
溴的[13C4,
D4]-5-(羟甲基)
噻唑。在
钯黑的催化作用下,
2,4-二溴噻唑的脱
溴反应为稳定同位素标记和潜在放射性同位素标记的
噻唑化合物提供了一种简单方便的合成方法。Copyright © 2009 John Wiley & Sons, Ltd. 版权所有。