Synthesis, Characterization, and Reactivity of Complex Tricyclic Oxonium Ions, Proposed Intermediates in Natural Product Biosynthesis
作者:Hau Sun Sam Chan、Q. Nhu N. Nguyen、Robert S. Paton、Jonathan W. Burton
DOI:10.1021/jacs.9b07438
日期:2019.10.9
Reactiveintermediates frequently play significant roles in the biosynthesis of numerous classes of natural products although the direct observation of these biosynthetically relevant species is rare. We present here direct evidence for the existence of complex, thermally unstable, tricyclic oxonium ions that have been postulated as key reactiveintermediates in the biosynthesis of numerous halogenated
Unified Approach for the Total Synthesis of Bis-THF C15 Acetogenins: A Chloroenyne from Laurencia majuscula, Laurendecumenyne B and Laurefurenynes A/B
作者:Chepuri V. Ramana、Sibadatta Senapati、Nivedya A. Unmesh、Manoj N. Shet、Iram Ahmad、Nandu Ajikumar
DOI:10.1055/a-1500-1407
日期:2021.8
A highly diastereoselective total synthesis of several bis-THF C15acetogenin class of natural products: chloroenyne fromLaurencia Majuscula, laurendecumenyne B laurefurenynes A/B and synthesis of an advanced intermediate reported in the earlier total synthesis of (E/Z)-elatenynes (formal Synthesis) are described. The salient features in the synthesis include epoxide opening, Birch reduction, Sharpless