Alkylation of 2-nitrobenzyl cyanides with alpha-halomethyl ketones furnishes ketonitriles which upon reduction with tin(II) chloride form quinoline-4-carbonitriles in good yields.
Application of Vicarious Nucleophilic Substitution to the Total Synthesis of dl-Physostigmine
摘要:
A concise, highly efficient formal total synthesis of dl-physostigmine is described, using a relatively simple method that should be adaptable to the synthesis of homologous members of this type of alkaloid. The key step in the synthesis is a new vicarious nucleophilic substitution reaction between p-nitroanisole and a C-silylated derivative of N-methylpyrrolidinone. Subsequent conversion of the initial adduct to the tricyclic framework of physostigmine follows a well-established protocol and provides the key intermediate 8 in high yield. The vicarious nucleophilic substitution reaction has also been extended to six-membered lactams, with encouraging results.
Reactions of organic anions. Part 110. Vicarious nucleophilic substitution of hydrogen in nitroarenes with .alpha.-substituted nitriles and esters. Direct .alpha.-cyanoalkylation and .alpha.-carbalkoxyalkylation of nitroarenes
作者:Mieczyslaw Makosza、Jerzy Winiarski
DOI:10.1021/jo00183a004
日期:1984.5
Reaction of organic anions. 96. Vicarious substitution of hydrogen in aromatic nitro compounds with acetonitrile derivatives
作者:Mieczyslaw Makosza、Jerzy Winiarski
DOI:10.1021/jo01296a045
日期:1980.4
MAKOSZA, M.;WINIARSKI, J., J. ORG. CHEM., 1984, 49, N 9, 1494-1499