Synthesis of tetrahydrofuran-based natural products and their carba analogs via stereoselective enzyme mediated Baeyer–Villiger oxidation
摘要:
In this work we present efficient formal syntheses of several biologically interesting natural products (showdomycin, goniofufurone, tratts-kumausyne) and their novel carba analogs by applying different Baeyer-Villiger monooxygenases. This strategy provides access to tetrahydrofuran-based natural products, C-nucleosides and both antipodes of the corresponding carba analogs in high optical purities (up to >95% ee) starting from simple achiral and commercially available building blocks (tetrabromoacetone, furan and cyclopentadiene). The striking key features of this chemo-enzymatic approach are the introduction of four stereogenic centers in as few as three reaction steps within a desymmetrization approach and the short-cut of several reaction sequences by the implementation of a biocatalytic step. (C) 2015 Elsevier Ltd. All rights reserved.
Efficient Palladium(II)-Mediated Construction of Functionalized Plakortone Cores
作者:Gregory C. Paddon-Jones、Natasha L. Hungerford、Patricia Hayes、William Kitching
DOI:10.1021/ol991055c
日期:1999.12.1
[GRAPHICS]Appropriate enediols experience a one-pot palladium(II)-mediated hydroxycyclization-carbonylation-lactonization sequence to provide sidechain-functionalized 2,6-dioxabicyclo[3.3.0]octan-3-ones, the core structures of the plakortones, a novel class of activators of cardiac SR-Ca2+-pumping ATPase, from the sponge Plakortis halichondrioides.
Total Synthesis of (2<i>S</i>,3<i>S</i>,5<i>S</i>,10<i>S</i>)- 6,9-Epoxynonadec-18-ene-7,10-diol and Formal Total Synthesis of (+)-<i>trans</i>-Kumausyne from <scp>d</scp>-Arabinose
作者:Rajendrakumar Reddy Gadikota、Christopher S. Callam、Todd L. Lowary