An effective synthetic approach has been demonstrated for the construction of diverse bicyclic fused cyclopentenones from Morita–Baylis–Hillman (MBH) carbonates of propiolaldehydes. The present transformation was initiated through the propargylation of an alkenylamine with an MBH carbonate followed by the Pauson–Khand reaction of the product methyl 3-(alkenylamino)-2-methylenealk-4-ynoate. This facile method provides diverse scaffolds of cyclopentenone fused with aza-cycles having additional functionality in good yields.
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Reddy et al. (2022) studied this question.
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