吡咯并[2,3- d ]嘧啶的液-液相和固-液相转移糖基化:与2'-deoxy-7-carbaguanosine相关的2-deoxy-β-D-rifurfuranosides的立体定向合成
摘要:
2-氨基-4-甲氧基-7 H-吡咯并[2,3- d ]嘧啶(3b)与2-脱氧-3,5-二-O-(对甲苯甲酰基)-的相转移糖基化的产率α- d -赤-pentofuranosyl酰氯(4)液体-液体的条件下是有限的(50%NaOH水溶液,CH 2氯2,卜4 NHSO 4)由于碱-不稳定的保护基团在halogenose的脱保护(4) 。更具亲脂性的2-氨基-4-烷氧基吡咯并[2,3- d ]嘧啶的应用,例如化合物(3d)或(3e)在某种程度上减少了副反应。为了克服这些困难,已经开发了使用非质子传递溶剂,固体KOH和穴状三[2-(2-甲氧基乙氧基)乙基]胺(TDA-1)的固液相转移糖基化技术。新的糖基化方法以立体定向的方式高产地导致了2-amino-4-alkoxy-(7a–c)或2-amino-4-chloro-7 H -pyrrolo [2,3 - d ] pyrimidine2-deoxy-β-
The Synthesis of N-{2-Amino-4-substituted [(Pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl}-L-glutamic Acids as Antineoplastic Agents
摘要:
A series of N-{2-amino-4-substituted[(pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl}-L-glutamic acids were synthesized. In this current synthesis, compound 2-amino-4-chloro-pyrrolo[2,3-d]pyrimidine (4) was selected as an important precursor for the preparation of key intermediates such as 5b, 10b, 15a and 15b. These highly functionalized pyrrolo[2,3-d]pyrimidines were then later coupled with either 4-ethynylbenzoylglutamate or 4-iodobenzoylglutamate in a palladium catalyzed Heck reaction and thus provided the basic skeleton of the targeted molecules. The availability of the chlorine atom at the 4-position of the pyrrolopyrimidine nucleus has allowed us to introduce different substituents at this position efficiently. By this approach, we were able to prepare a variety of 4-substituted pyrrolo[2,3d]pyrimidine based folate antagonists (2a-2g) which are closely related to the novel thymidylate synthase inhibitor LY231514. In vitro analysis has demonstrated that some of these agents are highly cytotoxic against human leukemic cells (CCRF-CEM) in culture.
Nitrogen Glycosylation Reactions Involving Pyrimidine and Purine Nucleoside Bases with Furanoside Sugars
作者:Lawrence J. Wilson、Michael W. Hager、Yahya A. El-Kattan、Dennis C. Liotta
DOI:10.1055/s-1995-4142
日期:1995.12
Different approaches for the synthesis of nucleoside analogs (potential HIV inhibitors) are described. Starting from a suitably substituted furanose ring, it is demonstrated that a high facial stereocontrol of the glycosylation reaction can be effected. Different reaction conditions including Lewis acid promoted, SN2 displacement and some enzymatic methodologies for the stereoselective synthesis of these compounds are reviewed.
The overexpression of NIK plays a critical role in liver inflammatory diseases. Treatment of such diseases with small-molecule NIK inhibitors is a reasonable but underexplored approach. In this paper, we reported the discovery of a potent and selective NIK inhibitor 46 (XT2). 46 inhibited the NIK kinase with an IC50 value of 9.1 nM in vitro, and it also potently suppressed NIK activities in intact
Purines and pyrimidines having a fused cyclopropane ring in the side chain and the heterocyclic isosteres of said purines and pyrimidines have antiviral activity, especially against viruses of the herpes class.
The syntheses and properties of tricyclic pyrrolo[2,3-d]pyrimidine analogues of S6-methylthioguanine and O6-methylguanine
作者:Ana R. Hornillo-Araujo、Adam J. M. Burrell、Miren K. Aiertza、Takayuki Shibata、David M. Hammond、Dolor?s Edmont、Harry Adams、Geoffrey P. Margison、David M. Williams
DOI:10.1039/b516447h
日期:——
The syntheses of novel tricyclic pyrrolo[2,3-d]pyrimidine analogues of S6-methylthioguanine are described. The crystal structures and pKa values of these and related O6-methylguanine analogues are reported. All compounds display higher pKa values than O6-methylguanine with the sulfur-containing analogues being the more basic and exhibiting higher stability in aqueous solution. In a standard substrate