Biomimetic Synthesis of Functionalized γ-Resorcylates from Dioxinone Derivatives
作者:Peter S. Blencowe、Anthony G. M. Barrett
DOI:10.1002/ejoc.201402473
日期:2014.8
Biomimetic syntheses of functionalizedγ-resorcylatesfrom 2,2,6-trimethyl-4H-1,3-dioxin-4-one derivatives are reported. Cross metathesis of 2,2-dimethyl-6-vinyl-4H-1,3-dioxin-4-one with homoallylic esters or aldol reactions of tert-butyl or benzyl esters with 1-(2,2-dimethyl-4-oxo-4H-1,3-dioxin-6-yl)-acetone and related ketones followed by aromatization under mild Appel-type reaction conditions gave
A Biocatalytic Route to Highly Enantioenriched β-Hydroxydioxinones
作者:Rick C. Betori、Eric R. Miller、Karl A. Scheidt
DOI:10.1002/adsc.201700095
日期:2017.4.3
A novel biocatalytic system to access a wide variety of β‐hydroxydioxinones from β‐ketodioxinones employing commercial engineered ketoreductases has been developed. This practical system provides a remarkably straightforward solution to limitations in accessing certain chemical scaffolds common in β‐hydroxydioxinones that are of great interest due to their diversification capabilities. A few highlights
Palladium-Catalyzed Carbonylative Couplings of Vinylogous Enolates: Application to Statin Structures
作者:Ilya S. Makarov、Takashi Kuwahara、Xavier Jusseau、Ilhyong Ryu、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/jacs.5b09342
日期:2015.11.11
The first Pd-catalyzed carbonylative couplings of aryl and vinyl halides with vinylogous enolates are reported generating products derived from C-C bondformation exclusively at the γ-position. Good results were obtained with a dienolate derivative of acetoacetate (1,3-dioxin-4-one). These transformations occurred at room temperature and importantly with only stoichiometric carbon monoxide in a two-chamber
their considerable applications in a variety of sectors. However, the development of direct asymmetric allylation of 4-hydroxypyran-2-ones is still restricted. Herein, we present an effective iridium-catalyzed asymmetric functionalization technique for the synthesis of 4-hydroxypyran-2-one derivatives over direct and efficient catalytic asymmetric Friedel–Crafts-type allylation by using allyl alcohols
Bi(OTf)<sub>3</sub>-promoted cascade annulation of hydroxy-pyranones and unsaturated γ-ketoesters for the construction of polycyclic bridged pyrano-furopyranones
作者:Akshay B. Rathod、Balasaheb R. Borade、Pooja I. Sambherao、Ravindar Kontham
DOI:10.1039/d3ob01862h
日期:——
three dimensional polycyclic bridged chromano-furopyranones and pyrano-furopyranones (closely related to bioactive natural products) via bismuth(III)-catalyzed cascade annulation of hydroxy-pyranones and unsaturated γ-ketoesters is presented. This process involves intermolecular Michael addition, intramolecular hemiketalization, lactonization, formation of one C–C bond and two C–O bonds, rings, and contiguous
提出了一种通过铋( III )催化羟基吡喃酮和不饱和γ-酮酯的级联环化构建复杂三维多环桥联色并呋喃并吡喃酮和吡喃并呋喃吡喃酮(与生物活性天然产物密切相关)的有效方案。这一过程涉及分子间迈克尔加成、分子内半缩酮化、内酯化、形成一个 C-C 键和两个 C-O 键、环和连续的立体中心。