Short Synthesis of Enantiopure C2-Symmetric 1,2:4,5-Diepoxypentane and “Pseudo”-C2-Symmetric 3-Azido-1,2:4,5-diepoxypentane from Arabitol
摘要:
On the basis of our previously described selective protection of arabitol as its 1,2:4,5-bis-pentylidene acetal 5, we report a straightforward synthesis of the novel "pseudo"-C-2-symmetric 3-azido-1,2:4,5-diepoxypentane building block 4 in 6 steps from arabitol. Using a similar synthetic route, an improved synthesis of the C-2-symmetrical 1,2:4,5-bis-epoxypentane building block I is described, also in 6 steps from arabitol. Both enantiomers of 1 and 4 are accessible, and all reactions involved are easily amenable for large-scale synthesis.
A Linchpin Carbacyclization Approach for the Synthesis of Carbanucleosides
作者:Leo M. H. Leung、Vicky Gibson、Bruno Linclau
DOI:10.1021/jo801848h
日期:2008.12.5
A convenientsynthesis of carbanucleosides, with both enantiomers equally accessible, is reported. The key step is a tandem linchpin cyclization process to give access to substituted carbafuranose derivatives having the correct relative stereochemistry for subsequent nucleobase introduction with inversion of configuration at C1. This was illustrated by the synthesis of 2',3'-dideoxycarbathymidine via
A Stereoselective Cyclization to Carbafuranose Derivatives Starting from 1,4-Bis-epoxides
作者:Leo M. H. Leung、A. James Boydell、Vicky Gibson、Mark E. Light、Bruno Linclau
DOI:10.1021/ol052009h
日期:2005.11.1
[reactions: see text] A concise synthesis of highly functionalized cyclopentane derivatives via a Brookrearrangementmediatedstereoselective linchpin cyclization reaction involving tert-butyldimethylsilyl-1,3-dithianyllithium and homochiral 1,4-bis-epoxides is described.
Monoepoxide 33 – also derived from dichlorodiol 12 – was ring-opened with the same Gilman cuprate affording compound 35. It was transformed into the correctly protected γ-lactone 6 in seven steps, key reactions being the ozonolysis 35 36 and the diastereoselective reduction 36 anti-37.
Total Synthesis of Sanctolide A and Formal Synthesis of (2<i>S</i>)-Sanctolide A
作者:Gihan C. Dissanayake、Cornelius N. Ndi、Jana L. Markley、James B. Martinez、Paul R. Hanson
DOI:10.1021/acs.joc.2c01922
日期:2023.1.20
sequential protocols for the total synthesis of the polyketide nonribosomal peptide macrolide, sanctolide A, and the formal synthesis of the (2S)-epimer of sanctolide A are reported. In this work, a phosphate tether-mediated one-pot sequential ring-closing metathesis/cross metathesis/substrate-controlled “H2”/tether removal approach was developed to accomplish the total synthesis of the natural product sanctolide
报道了两种合成策略,采用磷酸系链介导的一锅顺序方案来全合成聚酮化合物非核糖体肽大环内酯、santolide A,以及正式合成 sainttolide A 的 (2 S )-差向异构体。本工作开发了一种磷酸链介导的一锅顺序闭环复分解/交叉复分解/底物控制的“H 2 ”/链去除方法来完成天然产物santolide A的全合成。
Enantioselective Total Synthesis of the Polycyclic Guanidine-Containing Marine Alkaloid (−)-Batzelladine D
作者:P. Andrew Evans、Jun Qin、John E. Robinson、Bérangère Bazin