Abstract
AbstractThe influence of introducing substituents of increasing bulk in α position of tetracyclic imidazoline‐fused heteroazepinones on the course of hydrated imidazoline ring expansion (HIRE) reaction was established. Under certain conditions, substituted β‐aminoethanols can be used to obtain solely the ring expanded products from dibenzo[b,f][1,4]ox(thi)azepin‐11(10H)‐ones while with their unsubstituted counterparts, side chain expulsion was the only observable outcome.
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