作者:Dae-Kee Kim、Young-Woo Kim、Key H. Kim
DOI:10.1002/jhet.5570340148
日期:1997.1
Synthesis of 6-substituted 1-alkoxy-5-alkyluracils 2a-c have been achieved from readily accessible 2-alkyl-3,3-di(methylthio)acryloyl chlorides 4a,b in high overall yields. Treatment of 4a,b with silver cyanate followed by reaction of the resulting isocyanates 5a,b with an appropriate alkoxyamine afforded N-alkoxy-N′-[2-alkyl-3,3-di(methylthio)acryloyl]ureas 6a,b in 85–88% yields. Cyclization of 6a
从易于获得的2-烷基-3,3-二(甲硫基)丙烯酰氯4a,b已经以高的总收率实现了6-取代的1-烷氧基-5-烷基尿嘧啶2a-c的合成。的治疗4A,4B与氰酸银,然后将所得的异氰酸酯的反应5a,5b中与得到适当的烷氧基胺ñ -烷氧基- ñ ' - [2-烷基3,3-二(甲硫基)丙烯酰基]脲6A,6B在85–88%的产量。6a,b在含甲磺酸的乙酸中环化,然后用3-氯过氧苯甲酸氧化,得到高产率的1-烷氧基-5-烷基-6-(甲基磺酰基)尿嘧啶9a,b。9a,b与叠氮化钠,苯硫醇或苯硒醇的亲核加成消除反应生成6-叠氮基-1-丁氧基胸腺嘧啶(2a,98%),5-乙基-1-(2-苯氧基乙氧基)-6-(苯硫基)尿嘧啶(2b,95%)或5-乙基-1-(2-苯氧基乙氧基)-6-(苯基硒烯基)尿嘧啶(2c,91%)。