The reaction of the 5-thioformyluracil 1 with phenylhydrazine and various amines readily afforded the hydrazone 3a and Schiff bases 3b-d, respectively. Further, carbanions and Wittig reagents reacted with 1 to give pyrido[2, 3-d]pyrimidines 4 and 9. The corresponding 5-formyluracil 2 possessed much lower reactivities toward these nucleophiles than did 1.
5-
硫代甲酰尿
嘧啶1与苯
肼和各种胺的反应容易地分别得到腙3a和希夫碱3b-d。此外,碳负离子和维蒂希试剂与1反应得到
吡啶并[2, 3-d]
嘧啶4和9。相应的5-甲酰尿
嘧啶2对这些亲核试剂的反应活性比1低得多。