deprotection. On the other hand, the minor nucleoside wybutosine of yeast tRNA(Phe) was isolated on a scale of 80 microg by partial digestion of unfractionated tRNA (1 g) with nuclease P1, followed successively by reversed-phase column chromatography, complete digestion with nuclease P1/alkaline phosphatase, and reversed-phase HPLC. Comparison of this nucleoside with 2 has unambiguously established that
通过4,6-二甲基-9-氧代-3- [2,3,5-三-O-(叔丁基二甲基甲
硅烷基)之间的维蒂希反应,实现了3-β-D-
呋喃呋喃基甲氧基丁基丁(2)的改进合成。 -β-D-
呋喃呋喃糖基] -4,9-二氢-3H-
咪唑并[1,2-a]-
嘌呤-7-
甲醛(8)和由(R)-2-[[(甲氧羰基)
氨基]衍生的膦烷-3-(
三苯基膦酰基)
丙酸酯(9),然后依次进行甲基化,氢化和脱保护。另一方面,通过用
核酸酶P1部分消化未分级的tRNA(1 g),然后以反相柱色谱法,用
核酸酶完全消化,分离出酵母tRNA(Phe)的次要核苷Wybutosine的量为80微克。 P1 /碱性
磷酸酶和反相HPLC。