A new glycosylation method promoted by visible light with 3,5-dimethoxyphenyl glycoside as the donor was developed.
一种以3,5-二甲氧基苯基糖苷为供体的可见光促进糖基化方法被开发出来。
NIS/TMSOTf-Promoted Glycosidation of Glycosyl <i>ortho</i>-Hexynylbenzoates for Versatile Synthesis of <i>O</i>-Glycosides and Nucleosides
作者:Rongkun Liu、Qingting Hua、Qixin Lou、Jiazhe Wang、Xiaona Li、Zhi Ma、You Yang
DOI:10.1021/acs.joc.1c00151
日期:2021.3.19
approach with glycosyl ortho-hexynylbenzoates as donors for the highly efficient synthesis of O-glycosides and nucleosides. The glycosidation approach highlights the merits of mild reaction conditions, cheap promoters, extremely wide substrate scope, and good to excellent yields. Notably, the glycosidation approach performs very well in the construction of a series of challenging O- and N-glycosidic
An Efficient Approach to the Synthesis of Nucleosides: Gold(I)-Catalyzed N-Glycosylation of Pyrimidines and Purines with Glycosyl ortho-Alkynyl Benzoates
Persuaded with gold: The title reaction in the presence of [Ph3PAuNTf2] (Tf=trifluoromethanesulfonyl) led conveniently to the corresponding nucleosides with excellent regioselectivity (see scheme). Even purine derivatives underwent this transformation owing to the mild conditions, which enabled the use of protecting groups that would not usually be compatible with N‐glycosylation conditions.
a challenging task despite the advent of modern glycosidation techniques. Herein, alkynyl glycosyl carbonates are shown to be stable glycosyl donors that can be activated catalytically by gold and silver salts at 25 °C in just 15 min to produce glycosides in excellent yields. Benzoyl glycosyl carbonate donors are solid compounds with a long shelf life. This operationally simple protocol was found to
Synthesis of Nucleosides and Deoxynucleosides via Gold(I)-Catalyzed <i>N</i>-Glycosylation of Glycosyl (<i>Z</i>)-Ynenoates
作者:Rongkun Liu、Yan Chen、Jibin Zheng、Lvfeng Zhang、Tong Xu、Peng Xu、You Yang
DOI:10.1021/acs.orglett.2c03964
日期:2022.12.30
with purines was found to be very effective for regioselective synthesis of pyranosyl N9 purine nucleosides. Based on the catalytic N-glycosylation approach, convenient synthesis of two 5′-deoxynucleosides drugs (capecitabine and galocitabine), four 2′-deoxynucleoside drugs (floxuridine, trifluridine, decitabine and cladribine), four 3′,5′-dideoxynucleoside analogues, and four 2′,5′-dideoxynucleoside