Microwave-Assisted Regioselective Benzylation: An Access to Glycal Derivatives with a Free Hydroxyl Group at C4
作者:Tadeusz Bieg、Katarzyna Kral、Jadwiga Paszkowska、Wiesław Szeja、Ilona Wandzik
DOI:10.1080/07328303.2012.698438
日期:2012.9
D-glucal, D-galactal, and their 6-O-TBDMS derivatives were benzylated in a two-step procedure under microwave conditions. In the first step glycals were converted into dibutylstannylene acetal or tributyltin ether intermediates, which were next alkylated with benzyl bromide in the presence of Bu4NBr. In all cases the 4-OH group stayed unsubstituted. Microwave-assisted benzylation contributes to a significant
在微波条件下,分两步将D-葡萄糖,D-半乳糖及其6-O-TBDMS衍生物苄基化。在第一步中,将糖基转化为二丁基亚锡乙缩醛或三丁基锡醚中间体,然后将其在Bu 4 NBr存在下用苄基溴烷基化。在所有情况下,4-OH基团都保持未取代的状态。与传统的合成方法相比,微波辅助的苄基化反应大大减少了反应时间,传统的合成方法需要加热数小时。补充材料可用于本文。转到出版商的《碳水化合物化学杂志》在线版本以查看免费的补充文件。