Regioselective Monoalkylation of Dimethyl Alkylidenesuccinates: Simple Approach to Dialkyl-Substituted Maleic Anhydrides Including Chaetomellic Acid A
作者:Narshinha Argade、Umesh Kshirsagar
DOI:10.1055/s-0030-1260013
日期:2011.6
Natural and nonnatural dialkylmaleicanhydrides were readily prepared from dimethyl alkylidenesuccinates by sodium hexamethyldisilazide-induced selective monoalkylation followed by base-catalyzed hydrolysis. esters - alkylations - furans - heterocycles - maleic anhydrides
A Simple and Efficient Route to Chaetomellic Anhydride A: A Potent Natural Ras Farnesyl-Protein Transferase Inhibitor
作者:Laurent De Buyck、Franco Ghelfi、Rita Cagnoli、Giulia Merighi、Adele Mucci、Ugo Pagnoni、Andrew Parsons
DOI:10.1055/s-2004-829116
日期:——
A new and efficient approach to chaetomellic anhydride A has been devised starting from 2,2-dichloropalmitic acid. This involves the atom transfer radical cyclization of an N-alkyl-N-(3-chloro-2-propenyl)amide followed by rearrangement of the resulting trichloro-pyrrolidin-2-one.