Bromoalkylphthalazinones and isomeric oxazolinium salts as intermediates and synthons
作者:A. Csámpai、K. Körmendy、P. Sohár、F. Ruff
DOI:10.1016/s0040-4020(01)89500-4
日期:1989.1
compounds both the open-chain 2-bromoalkyl derivatives and their cyclic isomers. Substitutionreactions of bromoalkyl compounds may be assisted by polar solvents and by neighbouring group effect of hydrazinocarbonyl moiety. Nucleophiles attack the condensed oxazolinium ring in tricyclic intermediates at the saturatedcarbon bonded to the oxygen with ring opening. Addition of piperidine to unsaturated
The effect of conformational equilibrium on rate of reactions involving neighbouring group participation
作者:A. Csámpai、Ö. Farkas
DOI:10.1016/s0040-4020(01)92238-0
日期:1992.2
bromoalkylphthalazinones type is efficiently assisted by the neighbouring hydrazinocarbonyl group. The expected order of anchimeric assistance has been found to be dependent on the chain length. The relatively large values of rate constants are due to an entropy effect firmly supported by computed analysis of the conformational equilibria for the bromoethyl chain appended to phthalazinone () and 2,3-dihydroimidazo