Hydrated imidazoline ring expansion reaction in 2,3-dihydro-9H-dibenzo[b,f]imidazo-[2,1-d][1,5]oxazocinone derivatives.

The possibility of expanding a hydrated imidazoline fragment in 2,3-dihydro-9H-dibenzo[b,f]imidazo[2,1-d][1,5]oxazocines was demonstrated for the first time, which granted access to 6,11-dihydro-12H-dibenzo[b,f][1,5]oxazocin-12-one derivatives, previously undescribed compounds with medium-sized rings. In addition, it was shown that imidazooxazocines underwent expansion reactions more readily than their seven-membered analogs. [ABSTRACT FROM AUTHOR]