investigates. A stable 2′-O-triflyl derivative, that of N-nitro-3′,5′-O-(tetraisopropyldisiloxane-1,3-diyl)uridine, has been isolated for the first time; by contrast to its congeners, it does not give cyclonicleoside-like intermediates. Nucleophilic attacks on this substrate lead to 2′ß-substituted nucleosides rather than the usual 2′α epimers. 3′-O-Triflyl N-nitro derivatives behave similarly. Several
已经研究了N 3保护的
尿苷(N =
COPh,N = CH = CH = COOMe,N = NO 2)的
三氟甲磺酸。首次分离出一种稳定的2'- O- triflyl衍
生物,即N-硝基-3',5'- O-(四异丙基二
硅氧烷-1,3-二基)
尿苷。与它的同类物相比,它不提供类环烷甙的中间体。在该底物上的亲核攻击导致2'ß-取代的核苷,而不是通常的2'α差向异构体。3'- O- Triflyl N-硝基衍
生物的行为相似。几种新型核苷(lyxo 二卤代衍
生物,2',3'-α-环氧衍
生物)可通过这种方法获得。