Reactions of N-substituted pyridinium cations with carbanions: 5,6,8,9-tetrahydro-7-phenylbisbenzo[ah]acridine, a superior leaving group
作者:Alan R. Katritzky、Sukhpal S. Thind
DOI:10.1039/p19810000661
日期:——
N-Substituents are transferred from pyridiniumcations to malonate, cyanoacetate, and acetoacetate carbanions: for alkyl substituents the pentacyclic derivatives (4) attain the required activity.
Pyridiniums as potential synthetic substitutes for nitrogen mustards
作者:Alan R. Katritzky、Kevin Burgess、Ranjan C. Patel
DOI:10.1002/jhet.5570190408
日期:1982.7
Dialkylamino-alkyl primary amines 1b and 2b are converted by pyryliumsalts into the corresponding pyridinium derivatives. The pyridiniumsalts act as aminoalkylating agents for representative O-, S-, N-, and C-nucleophiles and are potentially safe substitutes for nitrogen mustards in the reactions.
Kinetics and mechanism of nucleophilic displacements with heterocycles as leaving groups. Part 23. Studies at the borderlines between reactions proceeding (<i>i</i>) via free carbocations, (<i>ii</i>) via rate-determining formation of ion–molecule pairs, and (<i>iii</i>) via rate-determining nucleophilic attack on ion–molecule pairs
作者:Alan R. Katritzky、Bogumil Brycki
DOI:10.1139/v86-192
日期:1986.6.1
first-order reaction via nucleophilic trapping of intimate ion–molecule pairs and first-order reaction via the formation of free carbocations, both mechanisms proceed independently, without merging. Similarly at the borderline between first-order (rate-determining formation) and second-order (rate-determining nucleophilic attack) reactions of intimate ion–molecule pairs, both reactions again proceed