Zenon Łotowski, Agnieszka Gryszkiewicz, Jolanta B. Borowiecka, Agnieszka Nikitiuk and Jacek W. Morzycki
The reaction of steroidal 2α-bromo-3-ketones (e.g. 2α-bromocholestan-3-one 2) with ammonia followed by hydrolysis and air-oxidation affords the easily separable mixture of the trans and cis dimeric steroid-pyrazines (3 and 4, respectively).