Alkylation of sterically hindered 1,3-diketones under phase-transfer conditions
摘要:
Sterically hindered 1,3-diketones react selectively with propargyl and allyl bromides under conditions of phase transfer catalysis to give C-alkylated products, whereas reactions with butyl and benzyl chlorides yield mixtures of C- and O-isomers. Gn increase in the size of the substituents present in the initial 1,3-diketone hampers introduction of the second propargyl group. The propargyl-substituted 1,3-diketones undergo cyclization under the alkylation conditions to give substituted furans.
Acylation of sterically hindered 2-propargyl-1,3-diketones
作者:S. I. Shergina、A. S. Zanina、I. E. Sokolov、M. S. Shvartsberg
DOI:10.1007/bf02494429
日期:1999.1
Sterically hindered 2-propargyl-1,3-diketones were acylated at the terminal acetylenic group by acyl chlorides in the presence of CuCl. Some peculiarities of the reaction were revealed.
Alkylation of sterically hindered 1,3-diketones under phase-transfer conditions
作者:A. S. Zanina、S. I. Shergina、I. E. Sokolov、M. S. Shvartsberg
DOI:10.1007/bf01435389
日期:1996.10
Sterically hindered 1,3-diketones react selectively with propargyl and allyl bromides under conditions of phase transfer catalysis to give C-alkylated products, whereas reactions with butyl and benzyl chlorides yield mixtures of C- and O-isomers. Gn increase in the size of the substituents present in the initial 1,3-diketone hampers introduction of the second propargyl group. The propargyl-substituted 1,3-diketones undergo cyclization under the alkylation conditions to give substituted furans.
Aminomethylation of hindered 2-propargyl-1,3-diketones
作者:A. S. Zanina、S. I. Shergina、I. E. Sokoiov、M. S. Shvartsberg
DOI:10.1007/bf01431628
日期:1996.5
Abstract2-Propargyl-substituted methoxy-1,3-diketones react with alkoxymethylamines or paraform and secondary amines in the presence of CuCl at the acetylene group to afford Mannich bases.