Reaction of isatin with alkylating agents with acidic methylenes
作者:María S. Shmidt、Isabel A. Perillo、Mercedes González、María M. Blanco
DOI:10.1016/j.tetlet.2012.03.010
日期:2012.5
The reaction of isatin (1) with different alkyl halides 2 and alkaline carbonates in aprotic polar solvents leads mainly to N-alkyl derivatives 3. The use of alkylating agents that have acidic methylenes leads to competitive formation of the corresponding epoxide 5. The formation of 5 is favored by low-polarity solvents at low temperatures and strong bases. Epoxides 5c, d obtained using NaEtOH/EtOH at 0-5 degrees C are transformed into the corresponding 4-quinolinones 6 at higher temperatures. The use of Ag2CO3 allows obtaining compounds 3 as major products, along with varying amounts of labile O-alkyl derivatives 4 and dimerization products. (C) 2012 Elsevier Ltd. All rights reserved.
Hantzsch, Chemische Berichte, 1922, vol. 55, p. 3182
作者:Hantzsch
DOI:——
日期:——
Miller David J., Scrowston Richard M., Kennewell Peter D., Westwood Rober+, Tetrahedron, 50 (1994) N 17, S 5159-5168
作者:Miller David J., Scrowston Richard M., Kennewell Peter D., Westwood Rober+