AMP Deaminase Inhibitors. 3. SAR of 3-(Carboxyarylalkyl)coformycin Aglycon Analogues
摘要:
N3-Substituted coformycin aglycon analogues with improved AMP deaminase (AMPDA) inhibitory potency are described. Replacement of the 5-carboxypentyl substituent in the lead AMPDA inhibitor 3-(5-carboxypentyl)-3,6,7,8-tetrahydroimidazo[4,5-d][1,3]diazepin-8-ol (2) described in the previous article with various carboxyarylalkyl groups resulted in compounds with 10-100-fold improved AMPDA inhibitory potencies. The optimal N3 substituent had m-carboxyphenyl with a two-carbon alkyl tether. For example, 3-[2-(3-carboxy-5-ethylphenyl)-ethyl]-3,6,7,8-tetrahydroimidazo[4,5-d] [1,3]diazepin-8-ol (43g) inhibited human AMPDA with a K-i = 0.06 mu M. The compounds within the series also exhibited >1000-fold specificity for AMPDA relative to adenosine deaminase.
报道了合成邻苯二甲酸盐和γ-丁内酯的简便策略。该方法在正式的Au(I)和Pd(II)催化的S N 2'反应中利用易于制备的烯丙醇。使用这些催化剂,观察到所需五元内酯的排他形成,完全避免了竞争的直接内酯化途径,后者与质子酸和其他金属盐形成了不希望的七元环。这种温和且操作简单的方法尤其可以耐受环乙亚甲基,应在邻苯二甲酸酯和萜烯合成中找到用途。
Asymmetricallylic alkylation (AAA) is a powerful method for the formation of highly useful, non-racemic allylic compounds. Here we present a complementary enantioselective process that generates allylic lactones via π-acid catalysis. More specifically, a catalytic enantioselective dehydrative lactonization of allylicalcohols using a novel PdII-catalyst containing the imidazole-based P,N-ligand (S)-StackPhos