Synthesis of 5-cyclopropyluracil and 5-cyclopropylcytosine by the Pd(0)-catalyzed coupling reaction
作者:Dan Peters、Anna-Britta Hörnfeldt、Salo Gronowitz
DOI:10.1002/jhet.5570280629
日期:1991.10
5-Cyclopropyluracil and cyclopropylcytosine were prepared by the Pd(0)-catalyzed coupling reaction of 5-bromo-2,4-di(trimethylsilyloxy)pyrimidine and 5-bromo-2,4-O,N-bis-trimethylsilylcytosine with tributylstan-nylcyclopropane. The reactions also gave dehalogenated pyrimidine bases as by-products. Attempts to use 2,4-O,N-bis-trimethylsilyl-5-iodocytosine as the halide gave complete dehalogenation.
5-环丙基尿嘧啶和环丙基胞嘧啶是通过Pd(0)催化的5-溴-2,4-二(三甲基甲硅烷氧基)嘧啶与5-溴-2,4- O,N-双-三甲基甲硅烷基胞嘧啶与三丁基锡的偶合反应制备的乙烯基环丙烷。反应还产生了脱卤的嘧啶碱作为副产物。尝试使用2,4 - O,N-双-三甲基甲硅烷基-5-碘胞嘧啶作为卤化物可以完全脱卤。