Reduction of 5-uracilylmethylenepyridinium salts by thiols. A model of the reduction step of the thymidylate synthase reaction
摘要:
Reaction of 1-(5-uracilylmethylene)pyridinium salts with thiols leads to the formation of the corresponding thymine derivatives. This transformation of a uracil derivative to the corresponding thymine is explained on the basis of the formation of an exocyclicmethylene intermediate, analogous to that proposed in the thymidylate synthase reaction, followed by its reduction by additional thiol, presumably involving a radical mechanism.
Reductive debromination and coupling reaction in the thermolysis of 5-bromouracils in N,N-dialkylamides. Cleavage of the C(5)–bromine bond by an initial electron-transfer process
Thermolysis of various 5-bromouracils (1) in N,N-dialkylamides results in the formation of methylenebisuracils (2) and reductive debrominated products (3)via cleavage of the C(5)–Br bond; the latter involves a one-electron transfer process. The product distribution between (2) and (3) depends upon the nature of substituents in the uracil ring.
modification, the authors discovered a new polymeric Cu-complex that contains μ3-CO3 bridges. The polymeric linear structure of the complex was established using single crystalX-ray analysis. FT-IR, UV-vis and DSC studies were also performed on the polymeric complex. This novel polymeric Cu-complex was found to efficiently catalyse C–O/C–S cross coupling reactions between chloropyrimidines and phenols/thiophenols
该手稿报道了新型聚合物铜络合物 ([Cu 3 (DMAP) 8 (μ 3 -CO 3 ) 2 ]I 2 ) n · x H 2 O 的合成和表征及其在 C-O 和 C 中的成功应用-S 交叉偶联反应用于合成具有生物学意义的重要苯氧基嘧啶和芳硫嘧啶支架。尝试采用Roy等人报道的方法合成[Cu(DMAP) 4 I]I。经过轻微修改,作者发现了一种包含 μ 3 -CO 3桥的新聚合铜络合物。使用单晶 X 射线分析建立了复合物的聚合线性结构。还对聚合物复合物进行了 FT-IR、UV-vis 和 DSC 研究。这种新型聚合铜配合物被发现可以在短时间内有效催化水性介质中氯嘧啶和苯酚/硫酚之间的C-O/C-S交叉偶联反应,产生相应的苯氧基嘧啶和芳硫嘧啶。使用该方案,成功合成了 22 个苯氧基嘧啶和 6 个芳硫嘧啶。使用1 H 和13 C NMR 光谱和 HRMS 分析对合成的新型化合物进行了很好的表征,并使用
Senda,S. et al., Journal of the Chemical Society. Perkin transactions I, 1975, p. 503 - 507
作者:Senda,S. et al.
DOI:——
日期:——
SAKO, MAGIOCHI;SUZUKI, MIKIO;TANABE, MIYUKI;MAKI, YOSHIFUMI, J. CHEM. SOC. PERKIN TRANS., 1981, N 12, 3114-3117
Synthesis of substituted uracils by the reactions of halouracils with selenium, sulfur, oxygen and nitrogen nucleophiles under focused microwave irradiation
Undermicrowaveirradiation, the nucleophilic substitutionreactions of halouracils with selenium, sulfur, oxygen and nitrogen nucleophiles was complete within several minutes with yields up to 99%. The method using microwaveirradiation is superior to those conducted under conventional heating processes.