Enantioselective Synthesis of Medium-Sized-Ring Lactones via Iridium-Catalyzed <i>Z</i>-Retentive Asymmetric Allylic Substitution Reaction
作者:Lu Ding、Hao Song、Chao Zheng、Shu-Li You
DOI:10.1021/jacs.2c01103
日期:2022.3.23
Medium-sized rings are important structural units, but their synthesis, especially in a highly enantioselective manner, has been a great challenge. Herein we report an enantioselectivesynthesis of medium-sized-ring lactones by an iridium-catalyzed Z-retentive asymmetric allylic substitution reaction. The reaction features mild conditions and a broad substrate scope. Various eight- to 11-membered-ring
中等大小的环是重要的结构单元,但它们的合成,特别是以高度对映选择性的方式,一直是一个巨大的挑战。在这里,我们报告了通过铱催化的Z保持不对称烯丙基取代反应对中型环内酯的对映选择性合成。该反应条件温和,底物范围广。各种 8 至 11 元环内酯可以中等至优异的产率(高达 88%)和优异的对映选择性(高达 99% ee)提供。Z-烯丙基前体和 Ir 催化剂的利用对于中等环的形成至关重要。
Synthesis and anti-hepatitis B activity of new substituted uracil and thiouracil glycosides
作者:Mohammed T. Abdel-Aal
DOI:10.1007/s12272-010-0601-y
日期:2010.6
A number of N- and S-substituted uracil and thiouracil glycosides were synthesized by coupling reaction of 5,6-dibenzyle pyrimidine derivatives with the corresponding acetobromosugar. The synthesized compounds were tested for their antiviral activity against hepatitis B virus. Plaque reduction infectivity assay was used to determine virus count reduction as a result of treatment with tested compounds which showed moderate to high antiviral activities.