A Stereoselective and Atom-Efficient Approach to Multifunctionalized Five- and Six-Membered Rings via a Novel Michael-Initiated Intramolecular Diels−Alder Furan Reaction Irishi N. N. Namboothiri Madhu Ganesh Shaikh M. Mobin Miriam Cojocaru 10.1021/jo048262x.s001 https://acs.figshare.com/articles/dataset/A_Stereoselective_and_Atom_Efficient_Approach_to_Multifunctionalized_Five_and_Six_Membered_Rings_via_a_Novel_Michael_Initiated_Intramolecular_Diels_Alder_Furan_Reaction/3295822 A variety of key precursors to the intramolecular Diels−Alder reaction of furan diene (IMDAF) have been prepared via a very facile 1,4-addition of O-, S-, N-, and C-centered nucleophiles possessing unsaturated tether to β-furyl nitroethylene. Subsequent IMDAF reaction of the 1,4-adducts, carried out under thermal conditions, provided five- and six-membered carbocycles and heterocycles fused to an easily cleavable oxabicycloheptene moiety. The structure and stereochemistry of the cycloadducts were determined by 2D-NMR experiments and further confirmed by X-ray crystallography. The salient features of the strategy include high degree of stereoselectivity (>80:20) in the cycloaddition, atom and step economy, and generation of multiple chiral centers and functionalities. The feasibility of the cleavage of the oxa bridge in the cycloadducts to afford novel multifunctional molecules has also been demonstrated. 2005-03-18 00:00:00 furan diene step economy cleavage generation feasibility intramolecular tether crystallography cycloaddition experiment Furan novel multifunctional molecules chiral centers precursor Stereoselective adduct oxa bridge Approach strategy Diel heterocycle functionalitie stereoselectivity cycloadduct nitroethylene cleavable oxabicycloheptene moiety Subsequent IMDAF reaction variety Multifunctionalized stereochemistry carbocycle furyl nucleophile Intramolecular