A Morita-Baylis-Hillman based route to C-5a-chain-extended 4-epi-isofagomine type glycosidase inhibitors
作者:René Lebl、Martin Thonhofer、Christina Tysoe、Bettina M. Pabst、Michael Schalli、Patrick Weber、Eduard Paschke、Arnold E. Stütz、Marion Tschernutter、Werner Windischhofer、Stephen G. Withers
DOI:10.1016/j.carres.2017.03.003
日期:2017.4
By Morita-Baylis-Hillman reaction of 2,3-O-isopropylidene-D-glyceraldehyde with α,β-unsaturated carbonyl as well as hetero analogous carbonyl compounds such as acrylonitrile, suitable precursors of isofagomine and of 4-epi-isofagomine are available. Elaboration of the structures by amine introduction, followed by intramolecular ring closure and subsequent hydroboration of the double bond provides 4-epi-isofagomine
通过Morita-Baylis-Hillman反应,可得到2,3-O-异亚丙基-D-甘油醛与α,β-不饱和羰基以及杂类似羰基化合物(例如丙烯腈)的异黄花碱和4-表-异黄花碱的合适前体。通过胺引入,随后的分子内闭环和随后的双键氢硼化对结构进行精制,提供了具有在C-5a处链增长的4-表位-异黄花胺衍生物,其由所用的羰基化合物的结构决定。例如,概述了β-半乳糖苷酶的有效抑制剂C-(5aR)-和C-(5aS)-5a-C-戊基-4-epi-异黄酮的合成。与报道的数据一致,发现(C-5aR)差向异构体是与GM1相关的人溶酶体β-半乳糖苷酶突变体R201C的高度有效的实验药理伴侣。