Partial reduction of 3-heteroatom substituted 2-furoic acids: the role of an ortho group in viability and stereoselectivity
作者:Timothy J. Donohoe、Andrew A. Calabrese、Jean-Baptiste Guillermin、Christopher. S. Frampton、Daryl Walter
DOI:10.1039/b203437a
日期:2002.7.26
The synthesis of 2-furoic acid derivatives containing both 3-methoxy and 3-TMS groups is described. Reductive alkylation proceeded well to give us access to a series of highly functionalised dihydrofurans with potential for further elaboration. Of the two groups tested at C-3, the TMS derivative was found to be the more useful and gave rise to high levels of stereoselectivity when attached to a furan
描述了同时含有3-甲氧基和3-TMS基团的2-糠酸衍生物的合成。还原性的烷基化 进展顺利,使我们能够使用一系列功能强大的功能 二氢呋喃具有进一步完善的潜力。在C-3测试的两组中,发现TMS衍生物更有用,当与C3连接时,产生高水平的立体选择性。呋喃在C-2处带有手性助剂。改变反应条件,使TMS基团在还原反应过程中裂解,而不会失去立体选择性。最后,还表明可以在酸性条件下除去手性助剂以形成被2-烷基-3-TMS取代的手性助剂。二氢呋喃 具有优异的对映体纯度水平。