Various anti-9-substituted [3.3]MCP-2,11-diones are exclusively obtained by the coupling reaction of the corresponding 1,3-bis(bromomethyl)benzenes and 2,6-bis[2-isocyano-2-(tolylsulfonyl)ethyl]-4-tert-butylbenzenes in dimethylformamide (DMF) with an excess of sodium hydride, from which the corresponding syn- [3.3]MCP are synthesised via anti-syn-isomerisation during the Wolff-Kishner reduction.
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