A series of 2-thiohydantoins were prepared as somatostatin subtype 4 (sst4) ligands. Reaction of a Nsubstituted-
 L-tryptophan methyl ester with an isothiocyanate in the presence of triethylamine readily afforded the target
 compounds. The 2-thiohydantoins were evaluated for binding affinities in cell lines expressing somatostatin receptor
 subtypes 2A (sst2A) and 4 (sst4). Compared to the thiourea NNC-26-9100 (3), all 2-thiohydantoins demonstrated lower
 binding affinities at sst4. Incorporation of the thiourea moiety into the more rigid 2-thiohydantoin nucleus leads to a loss
 of conformational freedom and may prevent optimal interaction with sst4.
                                    研究人员制备了一系列 2-
硫代海因作为体
生长抑素亚型 4(sst4)
配体。在
三乙胺存在下,N-取代-
L-色氨酸甲酯与异
硫氰酸盐反应,很容易得到目标化合物。在表达体
生长抑素受体亚型 2A (sst2A) 和 4 (sst4) 的
细胞系中,对 2-thiohydantoins 的结合亲和力进行了评估。与
硫脲 NNC-26-9100 (3)相比,所有 2-thiohydantoins 与 sst4 的结合亲和力都较低。将
硫脲分子掺入硬度更高的 2-thiohydantoin 核中会导致构象自由度的丧失,从而妨碍与 sst4 的最佳相互作用。