Furan Oxidation Strategy for the Synthesis of the Macrolactone Analogue of Migrastatin
作者:Yougant Airan、Kavirayani R. Prasad
DOI:10.1021/acs.joc.9b02413
日期:2019.11.15
Synthesis of the 14-membered macrolide core of migrastatin is accomplished by the use of furyl carbinol in 13 linear steps from furfural with ∼11% overall yield. Key strategies in the synthesis include the oxidative ring opening of furan and its use as a four-carbon synthon, SN2 displacement of a functionalized allyl bromide, and ring closing metathesis to obtain the macrolactone.
Total Synthesis of the Bis-silyl Ether of (+)-15-<i>epi</i>-Aetheramide A
作者:Omkar Revu、Kavirayani R. Prasad
DOI:10.1021/acs.joc.6b02535
日期:2017.1.6
depsipeptide aetheramide A was attempted by three different approaches. The first approach to form the macrolactone involving macrolactonization to form the C1–C21 bond and the second approach using a ring-closingmetathesis (RCM) strategy to form the C10–C11 olefinic bond failed. The third approach starting from R-mandelic acid, involving the RCM reaction to install the C18–C19 ring junction, was successful
Lasonolide A: Synthesis of
A and B Rings via a Cycloetherification Strategy
作者:David Hart、Suzanne Patterson、James Unch
DOI:10.1055/s-2003-40323
日期:——
Syntheses of tetrahydropyrans ent-2 and ent-3, substructures of the A and B rings of the enantiomer of lasonolide A (1), are described. The syntheses of ent-2 and ent-3 feature highly stereoselective cycloetherification reactions of bis-homoallylic alcohols 7 and 8.
本文介绍了四氢吡喃 ent-2 和 ent-3 的合成,它们是拉索诺内酯 A(1)对映体 A 环和 B 环的亚结构。ent-2和ent-3的合成过程以双高脂醇7和8的高度立体选择性环醚化反应为特征。
Evolution of an Efficient and Scalable Nine-Step (Longest Linear Sequence) Synthesis of Zincophorin Methyl Ester
作者:Liang-An Chen、Melissa A. Ashley、James L. Leighton
DOI:10.1021/jacs.7b01590
日期:2017.3.29
new synthesis of zincophorin methyl ester that proceeds in just nine steps in the longest linear sequence and proceeds in 10% overall yield. Additionally, the scalability and practicability of the route have been demonstrated by performing all of the steps on a meaningful scale. This synthesis thus represents by a significant margin the most step-economical, efficient, and practicable synthesis of this
Synthesis of γ-Lactones via the Kowalski Homologation Reaction: Protecting-Group-Free Divergent Total Syntheses of Eupomatilones-2,5,6, and 3-<i>epi</i>-Eupomatilone-6
作者:Hosam Choi、Hanho Jang、Hyoungsu Kim、Kiyoun Lee
DOI:10.1021/acs.orglett.9b02848
日期:2019.10.4
A highly efficient synthesis of functionalized chiral γ-butyrolactone scaffolds has been described. The basis of the approach is the Kowalski ester homologation that is modified for our proposed transformation. The newly developed methodology combines a divergent synthetic strategy to permit a straightforward protecting-group-free asymmetric totalsyntheses of eupomatilones-2,5,6, and 3-epi-eupomatilone-6