Synthetic studies towards NG-121: diastereoselective synthesis of NG-121 methyl ether

TitleSynthetic studies towards NG-121: diastereoselective synthesis of NG-121 methyl ether
Publication TypeJournal Article
Year of Publication2012
AuthorsSingh, M, Argade, NP
JournalSynthesis-Stuttgart
Volume44
Issue24
Pagination3797-3804
Date PublishedDEC
ISSN0039-7881
Keywords4-bromo-3, 5-dihydroxybenzoate, formylation, intramolecular cyclization, lactonization, NG-121 methyl ether, Stille coupling
Abstract

Starting from unsymmetrically O-protected methyl 4-bromo-3,5-dihydroxybenzoate, a facile synthesis of the methyl ether of bioactive natural product NG-121 was accomplished in very good overall yield. The key steps were: Stille coupling reaction of the farnesyl unit with the electron-rich phenolic segment; hydroxy-directed selective epoxidation of the farnesyl chain along with concomitant phenol-driven intramolecular regio- and diastereoselective ring closure to the corresponding hydroxybenzopyran; and regioselective formylation followed by in situ reductive lactonization.

DOI10.1055/s-0032-1317544
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)2.5
Divison category: 
Organic Chemistry