A highly efficient coupling of glycosyl stannanes and sulfonium salts enabled by synergistic Pd/Cu catalysis is disclosed, facilitating the construction of C-aryl/alkenyl glycals under mild conditions in high yields. The protocol tolerates a wide scope of functional groups including ketone, cyano, ester, amide, nitro, halide. The one-pot formal CH glycosylation starting from arene is demonstrated with
公开了通过协同 Pd/Cu 催化实现的糖基锡烷和硫鎓盐的高效偶联,促进了在温和条件下高产率地构建C-芳基/烯基糖醛。该协议容忍范围广泛的官能团,包括酮、氰基、酯、酰胺、硝基、卤化物。用二苯并噻吩基化/Stille 偶联的反应序列证明了从芳烃开始的一锅形式 C H 糖基化。此外,成功进行了克级反应,显示了该协议的高度适用性。
Preparation of C-aryl glucals via the palladium catalyzed coupling of metalated aromatics with 1-iodo-3,4,6-tri-O-(triisopropylsilyl)-D-glucal
作者:Richard W. Friesen、Richard W. Loo
DOI:10.1021/jo00016a003
日期:1991.8
The preparation of the novel iodo glucal 5 from 3,4,6-tri-O-(triisopropylsilyl)-D-glucal (4), via a two-step procedure involving C1 stannylation and subsequent tiniodine exchange, is described. The palladium-catalyzed coupling of 5 with a variety of metalated aromatics provides a facile and high yielding entry into C-aryl glucals, compounds that have been demonstrated to be useful precursors for the synthesis of C-aryl glycosides.