N4-Isobutyryl- and -(2-ethylhexanoyl)cytosines (Ia, b) were synthesized by acylation of cytosine. N4, 2', 3', 5'-Tetraacylcytidines (III) were synthesized by two methods involving stannic chloride catalysis. One involeves condensation of N4-acylcytosines (I) and 1-O-acetyl-2, 3, 5-tri-O-benzoyl-β-D-ribofuranose (II), and the other involves transribosylation between N4-acylcytosines and acyl-inosines or -guanosines (IVa-d). N4-Octanoyl-2', 3', 5'-triacetylcytidine (IIIf) waS converted into cytidine by deacylation in a good yield.
N4-异丁酰基和-(2-乙基己酰基)
胞嘧啶(Ia, b)是通过对
胞嘧啶进行酰化反应合成的。N4, 2', 3', 5'-四酰基
胞苷(III)通过两种方法合成,这两种方法都涉及
氯化锡催化。一种方法涉及N4-酰基
胞嘧啶(I)与1-O-乙酰基-2, 3, 5-三-O-苯甲酰基-β-D-
呋喃核糖的缩合反应(II),另一种方法涉及N4-酰基
胞嘧啶与酰基
肌苷或酰基
鸟苷(IVa-d)之间的转核苷酸反应。N4-辛酰基-2', 3', 5'-三乙酰基
胞苷(IIIf)通过去酰化反应高产率地转化为
胞苷。