Berkeleyacetals 是结构复杂的天然产物,具有强大的抗炎活性。高密度氧官能团和多环系统的存在提出了重大的合成挑战。在此,我们报告了一种构建伯克利缩醛四环核心系统的有效策略。我们的合成策略具有两个环加成([4+2] 和 [5+2])以形成四环核心和 Achmatowicz 重排,以制备含有 B 和 E 环的环化底物。
De Novo Asymmetric Approach to the Disaccharide Portion of SCH-47554
作者:George A. O'Doherty、Miaosheng Li、Xiaomei Yu
DOI:10.3987/com-10-s(e)114
日期:——
A method for the asymmetric synthesis of the disaccharide portion of SCH-47554 has been developed in 6 steps. The route is shorter than the reported route to a related disaccharide. The route involves the use of the Noyori reduction to establish the asymmetry of the D- and L-sugar portion of the molecule. Diastereoselective Pd-glycosylation reaction and subsequent post-glycosylation transformation are used to establish the remaining stereocenter.