Enantioselective Total Synthesis of (+)-Rogioloxepane A
摘要:
graphicThe enantioselective synthesis of (+)-rogioloxepane A has been achieved in 21 steps from 1,5-hexadien-3-ol. The key steps in the synthesis are an asymmetric glycolate alkylation leading to the diene 2 and a subsequent ring-closing metathesis to construct the oxepene core.
ZrCl<sub>4</sub> as an Efficient Catalyst for a Novel One-Pot Protection/Deprotection Synthetic Methodology
作者:Surendra Singh、Colm D. Duffy、Syed Tasadaque A. Shah、Patrick J. Guiry
DOI:10.1021/jo800932t
日期:2008.8.1
found to be an efficientcatalyst for the one-pot esterification and deprotection of (5S,6R)-5,6-diacetoxyoct-7-enoic acid in good yields (44−62%) with a lactone formed as a minor byproduct. ZrCl4 (10−20 mol %) was also sufficient to deprotect 1,3-dioxalane, bis-TBDMS ethers, and diacetate functional groups in excellent yields of up to 93%. ZrCl4 (1−10 mol %) also promoted diol protection as the acetonide
Protecting-Group-Free Route to Hydroxylated Pyrrolidine and Piperidine Derivatives through Cu(I)-Catalyzed Intramolecular Hydroamination of Alkenes
作者:Masaya Sawamura、Hirohisa Ohmiya、Mika Yoshida
DOI:10.1055/s-0030-1258527
日期:2010.9
An efficient approach to hydroxylated pyrrolidine and piperidinederivatives through the intramolecular hydroamination catalyzed by a Cu(I)-Xantphos system is described. The transformation allows for the short synthesis of N-alkylated aza-sugars without a protection-deprotection event of the hydroxy groups.
intramolecular transesterification with formation of a hydroxylated butanolide skeleton does not annihilate their microfilament disrupting capacity. This finding calls for a reinvestigation of the biological profile of other fungal metabolites that embody a similar motif. Microcarpalide (1) serving as the calibration point for this comparative study was prepared by total synthesis based on ring-closing metathesis
Substrate-Controlled Asymmetric Total Synthesis and Structure Revision of (−)-Bisezakyne A
作者:Iljin Shin、Dongjoo Lee、Hyoungsu Kim
DOI:10.1021/acs.orglett.6b02239
日期:2016.9.2
The first asymmetric total synthesis and subsequent structure revision of (−)-bisezakyne A, a Laurencia C15 acetogenin from Alpysia oculifera, has been accomplished. Our substrate-controlled synthesis of this oxolane natural product features a highly stereoselective “protecting-group-dependent” intramolecular amide enolate alkylation strategy for the synthesis of the key 9,10-trans-9,12-cis-10-hydroxytetrahydrofuran
已完成(-)-bisezakyne A(一种来自Alpysia oculifera的Laurencia C 15醋酸原)的首次不对称总合成和后续结构修饰。我们对该环氧乙烷天然产物的底物控制合成具有高度立体选择性的“保护基依赖性”分子内酰胺烯酸酯烷基化策略,可通过以下方式合成关键的9,10-反式-9,12-顺式-10-羟基四氢呋喃中间体非螯合”控制。此外,我们的合成确定了卤代海洋天然产物的绝对构型。
Shortest Enantioselective Total Syntheses of (+)-Isolaurepinnacin and (+)-Neoisoprelaurefucin
作者:Victoria Sinka、Daniel A. Cruz、Víctor S. Martín、Juan I. Padrón
DOI:10.1021/acs.orglett.2c01769
日期:2022.7.29
The shortest enantioselectivetotalsyntheses of (+)-isolaurepinnacin and (+)-neoisoprelaurefucin have been accomplished. These syntheses were based on a common parallel synthetic strategy using Prins–Peterson cyclization in their core construction. In only one step, a seven-membered ring oxacycle with the correct cis-stereochemistry ring closure and the Δ4 position of the endocyclic double bond in