Switching between <i>X</i>-Pyrano-, <i>X</i>-Furano-, and Anhydro-<i>X</i>-pyranoside Synthesis (X = C, N) under Lewis acid Catalyzed Conditions
作者:Youngran Seo、Jared M. Lowe、Neyen Romano、Michel R. Gagné
DOI:10.1021/acs.orglett.1c01713
日期:2021.8.6
A variety of C-glycosides can be obtained from the fluoroarylborane (B(C6F5)3) or silylium (R3Si+) catalyzed functionalization of 1-MeO- and per-TMS-sugars with TMS-X reagents. A one-step functionalization with a change as simple as the addition order and/or Lewis acid and TMS-X enables one to afford chiral synthons that are common (C-pyranosides), have few viable synthetic methods (C-furanosides)
各种C-糖苷可以从氟芳基硼烷(B(C 6 F 5 ) 3 )或硅基(R 3 Si + )催化的1-MeO-和全TMS-糖与TMS-X试剂的官能化获得。一步功能化只需简单地改变加成顺序和/或路易斯酸和 TMS-X,即可获得常见的手性合成子( C-吡喃糖苷),但几乎没有可行的合成方法( C-呋喃糖苷),或实际上是未知的(脱水-C-吡喃糖苷),其机械地分别由是否发生直接取代、异构化/取代或取代/异构化而产生。