N-(3,4-dihydro-4-oxoquinazolin-3-yl)pyridmium imides: aziridinating agents for alkenes: measurement of rotational barriers around each N–N bond in an N–N–N system
Abstract
Pyridinium imides 3–5 and 8 are obtained as crystalline solids from the reaction of 3-acetoxyaminoquinazolinones 2 and 10 with the corresponding pyridines; barriers to rotation around each of the N–N bonds in 3 have been measured by NMR spectroscopy, and the imides 3–5 react both with styrene and with diethyl fumarate to give the corresponding aziridines.