作者:Valerije Vr?ek、Vesna ?aplar
DOI:10.1002/hlca.19950780714
日期:1995.11.1
The 1′,2′-unsaturated 2′,3′-secoadenosine and 2′,3′-secouridine analogues were synthesized by the regioselective elimination of the corresponding 2′,3′-ditosylates, 2 and 18, respectively, under basic conditions. The observed regioselectivity may be explained by the higher acidity and, hence, preferential elimination of the anomeric H–C(1′) in comparison to HC(4′). The retained (tol-4-yl)sulfonyloxy
1',2'-不饱和2',3'-secoadenosine和2',3'-secouridine类似物是通过在碱性条件下分别区域选择性地去除2',3'-二甲苯磺酸酯2和18合成的。观察到的区域选择性可以用较高的酸度来解释,因此,与HC(4')相比,优先消除异头HC(1')。在C(3')为3时保留的(toul-4-yl)磺酰氧基可通过亲核取代制备3'-叠氮基,3'-氯和3'-羟基衍生物5-7。ZnBr 2在干燥的CH 2氯2据发现,在除去三苯甲基的过程中,成功的去除了三苯甲基(85%),而对酸敏感的,烯酮衍生的N,O-缩酮功能没有任何裂解。在尿苷系列中,碱基促进的区域选择性消除(19),叠氮化物对甲苯磺酰基的亲核置换(20)和受保护的N(3)-酰亚胺功能的脱苄基作用得到1',2'-不饱和5'- O -三苯甲基-3'-叠氮基-水our苷衍生物21。通过对反应的2,2'-脱水-3'-叠氮基-3'-叠氮基-3'-脱氧-5'