Pyrimidines. 6. 6-trifluoromethyl chloropyrimidines and related compounds
作者:Herman Gershon、Anthony T. Grefig、Alfred A. Scala
DOI:10.1002/jhet.5570200145
日期:1983.1
with phosphorus oxychloride and phosphorus pentachloride, 2,4-dichloro-6-trifluoro-methylpyrimidine (7) (25%) and 4-chloro-6-trifluoromethylpyrimidin-2-yldichlorophosphate (8) (53%) were obtained. Compound 8 was converted to 7 by treatment with hydrogen chloride in phosphorus oxychloride in 72% yield. In a one-pot synthesis, 77% of 7 was obtained from 6. The preparation of 2,4,5-trichloro-6-tri-fluoromethyluracil
对6-三氟甲基嘧啶的氯化进行了研究。在用三氯氧化磷和五氯化磷依次处理6-三氟甲基尿嘧啶(6)时,2,4-二氯-6-三氟甲基嘧啶(7)(25%)和4-氯-6-三氟甲基嘧啶-2-基二氯磷酸( 8)(53%)获得。通过用氯化氢的三氯氧化磷溶液处理,将化合物8转化为7,产率为72%。在一锅法合成中,从6获得了7的77%。2,4,5-三氯-6-三氟甲基尿嘧啶(16)的制备类似地进行。尽管已经提出了嘧啶基二氯磷酸酯作为将嘧啶醇转化为氯嘧啶的中间体,但这些是要分离,表征并制备成环氯化嘧啶的这类化合物的第一个实例。