Reactivity of conformationally constrained bispropargyl sulfones: complete preference for 6π-electrocyclization process |
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Authors: | Debaki Ghosh Saibal JanaArpita Panja Anakuthil Anoop Amit Basak |
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Institution: | Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India |
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Abstract: | The reactivity of a series of conformationally constrained bispropargyl sulfones with an ortho alkenyl moiety was studied. Under basic condition, these molecules underwent isomerization, first to monoallene followed by 6π-electrocyclization (6π-EC). Another cycle of isomerization and 6π-EC gave the bis naphthyl sulfones. No Garratt–Braverman (GB) Cyclization product could be isolated even on easing up the strain. Computations with DFT (at BP86-D3/def2-SVP level) indicated that, it is energetically more favorable for the initially formed monoallenic intermediate to undergo electrocyclization rather than isomerize to bisallene. This is in contrast to the acyclic unconstrained counterpart, where isomerization to bisallene is preferred and competing GBC/6π-EC of bisallenes results in mixture of products. |
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Keywords: | Garratt&ndash Braverman cyclization Electrocyclization Sulfone Bis-propargyl Bis-allene Biradical |
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