A general approach to γ-lactones via osmium-catalyzed asymmetric dihydroxylation. Synthesis of (−)- and (+)-muricatacin.
作者:Zhi-Min Wang、Xiu-Lian Zhang、K.Barry Sharpless、Subhash C. Sinha、Anjana Sinha-Bagchi、Ehud Keinan
DOI:10.1016/s0040-4039(00)79001-0
日期:1992.10
γ-lactones have been prepared highly enantioselectively (92–99% ee) using either AD-mix-β or AD-mix-α with both β,γ- and γ,δ-unsaturated esters. The method is exemplified by the three-step synthesis of (−) and (+)-muricatacin in 74% yield and >99% ee.
Pd-Catalyzed Site-Selective Mono-allylic Substitution and Bis-arylation by Directed Allylic C–H Activation: Synthesis of <i>anti</i>-γ-(Aryl,Styryl)-β-hydroxy Acids and Highly Substituted Tetrahydrofurans
作者:Jothi L. Nallasivam、Rodney A. Fernandes
DOI:10.1021/jacs.6b06438
日期:2016.10.12
An efficient palladium-catalyzed site-selective arylation of γ-vinyl-γ-lactone by aryl boronic acid has been developed. γ-Vinyl-γ-lactone 1a has been contemplated as allyl electrophile donor for allylicarylation via π-allyl palladium intermediate using 1.5 equiv of aryl boronic acid 2. Using 3.0 equiv of the latter resulted in mono-arylation by allylic substitution and subsequent site-selective second
An Approach to <i>Lauroxanes</i> by Iterative Use of Co<sub>2</sub>(CO)<sub>6</sub>-Acetylenic Complexes. A Formal Synthesis of (+)-Laurencin
作者:Nuria Ortega、Victor S. Martín、Tomás Martín
DOI:10.1021/jo101566x
日期:2010.10.1
Nicholas reaction to form unsaturated branched linear ethers, a ring closing metathesis to obtain the cobalt complex cyclic ethers, and an isomerization promoted by montmorillonite K-10. A short synthesis of cyclic ethers of seven-, eight-, and nine-memberedrings is described. Additionally, the methodology is exemplified by the formal synthesis of (+)-laurencin, a red algae metabolite.