4-Chloro-5 H -1,2,3-dithiazol-5-one:一种很好的α,β-不饱和β-氨基酯的α-硫氰化剂
摘要:
在120°C下于DMSO中用3-烷基(或芳基)-3-氨基-2-丙烯酸酯处理4-氯-5 H -1,2,3-二噻唑-5-酮,得到相应的2-硫氰酸酯4(主要)和5-烷氧基羰基-4-烷基(或芳基)-4-噻唑啉-2-酮5(次要),而在相同条件下在C-3带有强吸电子基团的酯得到5和/或4-取代的5-烷氧基羰基-2-氨基噻唑6,取决于吸电子基团。
Pharmacological suppression of leukotriene biosynthesis by inhibitors of 5-lipoxygenase (5-LO) is a strategy to intervene with inflammatory and allergic disorders. We recently presented 2-amino-5-hydroxy-1H-indoles as efficient 5-LO inhibitors in cell-based and cell-free assays. Structural optimization led to novel benzo[g]indole-3-carboxylates exemplified by ethyl 2-(3-chlorobenzyl)-5-hydroxy-1H-benzo[g]indole-3-carboxylate (compound 11a), which inhibits 5-LO activity in human neutrophils and recombinant human 5-LO with IC50 values of 0.23 and 0.086 mu M, respectively. Notably, 11a efficiently blocks 5-LO product formation in human whole blood assays (IC50 = 0.83-1.6 mu M) and significantly prevented leukotriene B-4 production in pleural exudates of carrageenan-treated rats, associated with reduced severity of pleurisy. Together, on the basis of their high potency against 5-LO and the marked efficacy in biological systems, these novel and straightforward benzo[g]indole-3-carboxylates may have potential as anti-inflammatory therapeutics.