An Unexpected Dihalogenation/Dehydrogenation Product Derived­ via Iodolactonization of an N-Tosyl-N-[6-(2-cyclopenten-1-yl)-2-methylphenyl]glycine

Abstract

The reaction between N-tosyl-N-[6-(2-cyclopenten-1-yl)phenyl]glycine (syn/anti atropisomeric mixture) and molecular iodine is studied. Along with the expected 8-exo-cyclization product possessing a 3-iodo-2,3,3a,6,7,11b-hexahydrobenzo[e]cyclopenta[g][1,4]oxazocine core, the unexpected 1,11b-dehydrogenated/1-iodinated analogue with a 1,3-diiodo-3,3a,6,7-tetrahydrobenzo[e]cyclopenta[g][1,4]oxazocine structure is observed for the first time in a conventional halolactonization reaction.

Key words

benzoxazepines - halolactonization - atropisomers - glycine - X-ray crystal structure analysis

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