Hybrids of sugars and aromatics: A Pd-catalyzed modular approach to chromans and isochromans
作者:Markus Leibeling、Dennis C. Koester、Martin Pawliczek、Daniel Kratzert、Birger Dittrich、Daniel B. Werz
DOI:10.1016/j.bmc.2010.03.004
日期:2010.6.1
of our synthetic approach is the annelation of the benzene moiety via a highly efficient Pd-catalyzed domino reaction. This powerful approach led to a small library of highly substituted chromans and isochromans by making use of a variety of different diynes and bromoglycals. We investigated several Pd-catalysts in order to improve the yields and to enlarge the scope of the domino reaction. Furthermore
在此,我们描述了使用碳水化合物作为起始原料的高度取代的苯并二氢吡喃和异苯并二氢吡喃的合成。我们合成方法的关键步骤是通过高效的Pd催化的多米诺反应使苯部分成环。这种强大的方法通过使用各种不同的二炔和溴代糖,形成了一个高度取代的色团和异色团的小型文库。我们研究了几种钯催化剂,以提高收率并扩大多米诺反应的范围。此外,我们通过同位素标记实验阐明了反应的机理。该反应最有可能通过氧化加成进行,接着是两个碳钯化步骤和最后的环化反应。