Full characterization, thermal decomposition, and some reactions of 1-(2-adamantyl)-3-(1-adamantyl)aziridin-2-one

ORGN 421

Istvan Lengyel, Tony Taldone, taldone@yahoo.com, Theresa M. Lyons, tlyons13@yahoo.com, and Victor O. Cesare, cesarev@stjohns.edu. Chemistry Department, St. John's University, 8000 Utopia Parkway, Jamaica, NY 11439
We found that 1-(2-adamantyl)-3-tert-butylaziridin-2-one (5a) is unstable. It slowly decomposes at room temperature, although detectable by IR spectroscopy (1840 cm-1 band in CCl4). On the other hand, a closely related analogue, 1-(2-adamantyl)-3-(1-adamantyl)aziridin-2-one (5b), is very stable, in concurrence with an earlier report 1. We fully characterized aziridinone 5b, identified its thermal decomposition products (7 and 8) and reacted it with two aprotic ionic (tBuO- and HO-) and one protic non-ionic nucleophile (benzylamine). All three products (9b, 10, and 11) result from exclusive cleavage of the lactam (1-2) bond.