An improved process for the preparation of pyrimidine derivatives is provided comprising reacting a Wittig reagent of the general formula
wherein R is an alkyl of from 1 to 10 carbon atoms, aryl or arylalkyl, R
1
is a substituted or unsubstituted hydrocarbon group, R
2
and R
3
are the same or different and are hydrogen or a substituted or unsubstituted hydrocarbon group; Z is sulfur, oxygen, sulfonyl, or imino which may be substituted by formyl, acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, amino substituted by sulfonyl or alkylsulfonyl, and sulfonyl substituted by alkyl, amino or alkylamino and X is a halogen; with an aldehyde of the general formula
wherein R
4
is hydrogen, a lower alkyl or a cation capable of forming a non-toxic pharmaceutically acceptable salt and each R
5
are the same or different and are hydrogen or a hydrolyzable protecting group, or each R
5
, together with the oxygen atom to which each is bonded, form a hydrolyzable cyclic protecting group, or each R
5
is bonded to the same substituent which is bonded to each oxygen atom to form a hydrolyzable protecting group; in the presence of a base.
提供了一种改进的制备
嘧啶衍
生物的过程,包括将一般式为的Wittig试剂与一般式为的醛反应,其中R是由1至10个碳原子组成的烷基、芳基或芳基烷基,R1是取代或未取代的碳氢基团,R2和R3相同或不同,是氢或取代或未取代的碳氢基团;Z是
硫、氧、磺酰基或
亚胺,可以被甲酰、乙酰、丙酰、丁酰、异丁酰、戊酰、异戊酰、
氨基取代的磺酰基或烷基磺酰基取代,以及烷基、
氨基或烷基
氨基取代的磺酰基取代,X是卤素;R4是氢、较低烷基或能形成无毒药用可接受盐的阳离子,每个R5相同或不同,是氢或可
水解保护基,或每个R5与其结合的氧原子形成可
水解的环保护基,或每个R5结合到与每个氧原子结合的相同取代基上形成可
水解的保护基;在碱存在下。