4-氮杂环丁烷。2 †。于吡嗪并[2,3- e ]-作为-三嗪环系统共价添加方式的光谱,色谱和X射线晶体学研究
摘要:
未知吡嗪并[2,3- e ]-为-三嗪环系统的第一个例子,即6,7-二羟基-5,6,7,8-四氢吡嗪并[2,3 - e ]-为-通过将选定的5,6-二氨基-作为-三嗪与40%的乙二醛水溶液闭环来制备三嗪。这些4-氮杂环丁烷在C(7)位置经历与醇的新型交换过程。当溶于醇中并在室温下搅拌时,形成并分离出7-烷氧基,6-羟基类似物。实际上,在闭环过程中,如果将醇用作溶剂,则仅获得后者的化合物。最初,邻位-二氨基-环化为带有乙二醛的β-三嗪以立体选择性方式进行,同时产生顺式和反式加合物。单晶X射线衍射研究已确定主要和最稳定的加合物是反式(R,R或S,S)异构体。光谱法(nmr)证实了顺式加合物的中间体,但是由于上述交换过程,仅反式异构体被分离出来。这些σ加合物的交换位点已严格确定为C(7)。提出了发生这种交换过程的可能的反应机理。
Acyclic nucleoside analogues of antiviral DHPA and HPMPA have been prepared. Coupling of silylated 6-azauracils with benzyl glycidyl. ether and stannic chloride followed by the deprotection with boron trichloride gave 1-(2,3-dihydroxypropyl)-6-azauracils (3) in good overall yields. Reaction of silylated 6-azauracil and epichlorohydrin with or without catalytic stannic chloride afforded 1-(2-chloro-3-hydroxypropyl)-6-azauracil (4a) and 1-(3-chloro-2-hydroxypropyl)-6-azauracil (6a) respectively. Coupling of silylated 6-azaisocytosine under the same reaction conditions provided 1-(2,3-dihydroxypropyl)-6-azaisocytosine (9) and 1-(2-chloro-3-hydroxypropyl)-6-azaisocytosine (10) respectively. None of the compounds exhibited significant antiviral activity against herpes simplex viruses.
Tzeng Cherng-Chyi, Panzica Raymond P., Riand Jacques, Chenon Marie-Theres+, J. Chem. Soc. Perkin Trans. 2, (1994) N 12, S 2563- 2570
作者:Tzeng Cherng-Chyi, Panzica Raymond P., Riand Jacques, Chenon Marie-Theres+