作者:Mahesh K. Lakshman、Amit Kumar、Raghavan Balachandran、Billy W. Day、Graciela Andrei、Robert Snoeck、Jan Balzarini
DOI:10.1021/jo300628y
日期:2012.7.20
with t-BuONO and TMS-N3 yield the C-2 azido derivatives. We have previously analyzed the solvent-dependent azide·tetrazole equilibrium of C-6 azidopurine nucleosides, and in contrast to these, the O6-allyl C-2 azido nucleosides appear to exist predominantly in the azido form, relatively independent of solvent polarity. In the presently described cases, the tetrazole appears to be very minor. Consistent
O 6 -(苯并三唑-1 H -基)鸟苷及其2'-脱氧类似物很容易转化为O 6 -烯丙基衍生物,在与t -BuONO和TMS-N 3重氮化后产生C-2叠氮衍生物。我们之前已经分析了 C-6 叠氮嘌呤核苷的溶剂依赖性叠氮·四唑平衡,与此相反,O 6 -烯丙基 C-2 叠氮核苷似乎主要以叠氮形式存在,相对独立于溶剂极性。在目前描述的情况下,四唑似乎非常少。与叠氮官能团的存在一致,每个纯 C-2 叠氮化物在 2126-2130 cm -1处显示出突出的红外波段. 叠氮核苷与炔烃连接的条件筛选表明,在t- BuOH/H 2 O中的 CuCl是最佳的,C-2 1,2,3-三唑基核苷的产率为 70-82%。用 Et 3 N·3HF去除甲硅烷基,然后用 PhSO 2 Na/Pd(PPh 3 ) 4 去烯丙基化,得到 C-2 三唑基肌苷核苷。在继续证明O 6 -(benzotriazol-1 H-yl)嘌呤核苷,一种