Upon lithiation with LDA, 2', 3'-O-isopropylidene-5'-O-methoxymethyl-5, 6-dihydrouridine has been shown to serve as an "amide α-anion". Thus, acylation of the resulting dianion took place regiospecifically at the C-5 position. The subsequent phenylselenenylation and oxidative elimination afforded 5-acyluridines.
在与
LDA锂化后,2', 3'-O-异
丙烯基-5'-O-甲氧基甲基-5, 6-二氢
尿苷被证明可以作为“酰胺α-负离子”。因此,最终的双负离子在C-5位点发生了区域特异性酰化。随后的苯
硒烯基化和氧化消除生成了5-酰基
尿苷。