Chemoenzymatic and enantioselective assembly of the (1α,3aβ,6α,7aβ)-octahydro-1,6-methano-1H-indene framework associated with 2-isocyanoallopupukeanane: validation of a new synthetic strategy and the identification of enantiomeric switching regimes
摘要:
The octahydro-1,6-methano-1H-indene framework associated with the marine sesquiterpenoid 2-isocyanoallopupukeanane (1) has been prepared in enantiomerically pure form from the cis-1,2-dihydrocatechol 8 using Diels-Alder cycloaddition, oxa-di-pi-methane rearrangement and intramolecular enolate alkylation steps as the key bond-forming events. Three distinct strategies for employing such sequences in the selective synthesis of either enantiomeric form of the target framework have been identified. (C) 2010 Elsevier Ltd. All rights reserved.
Chemoenzymatic and enantioselective assembly of the (1α,3aβ,6α,7aβ)-octahydro-1,6-methano-1H-indene framework associated with 2-isocyanoallopupukeanane: validation of a new synthetic strategy and the identification of enantiomeric switching regimes
摘要:
The octahydro-1,6-methano-1H-indene framework associated with the marine sesquiterpenoid 2-isocyanoallopupukeanane (1) has been prepared in enantiomerically pure form from the cis-1,2-dihydrocatechol 8 using Diels-Alder cycloaddition, oxa-di-pi-methane rearrangement and intramolecular enolate alkylation steps as the key bond-forming events. Three distinct strategies for employing such sequences in the selective synthesis of either enantiomeric form of the target framework have been identified. (C) 2010 Elsevier Ltd. All rights reserved.