Regio- and stereo-chemical outcomes in the nucleophilic ring cleavage reactions of mono-epoxides derived from cis-1,2-dihydrocatechols
1997
Reactions of the mono-epoxy derivatives, 4–7, of the
cis-1,2-dihydrocatechols 1 and 2 with various oxygen-,
nitrogen-, carbon- and halogen-centred nucleophiles have been studied.
In both direct and acid-catalysed processes these epoxides react
exclusively by the pathway involving nucleophilic attack at 5a-C of the
substrate and such regioselectivity has been exploited in a synthesis of
the fluoro-deoxy-conduritol 32. Palladium-catalysed nucleophilic
additions to epoxide 4 proceed in the same regiochemical sense (attack
at 5a-C) but with overall retention of configuration. A competing
process associated with palladium-catalysed addition of phthalimide to
epoxide 4 is isomerisation of the substrate to cyclohexenone 41. Product
structures have been established by single-crystal X-ray analyses and
chemical correlation studies.
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