Singh B, Pandey SK, Malik N, Ramasastry SSV. Morita-Baylis-Hillman Spirannulation under Phosphine- and Anion-Binding Catalysis.
Org Lett 2024;
26:3273-3278. [PMID:
38587460 DOI:
10.1021/acs.orglett.4c00847]
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Abstract
We introduce an advancement in Morita-Baylis-Hillman (MBH) chemistry that provides access to α-spirannulated enones. The treatment of enone-tethered azaarenium salts with catalytic amounts of organophosphines provides spiroindenyl dihydropyridines. It represents the α-spirannulation of enones via an intramolecular MBH (IMBH) reaction utilizing dual phosphine- and anion-binding catalysis. The IMBH adducts were subjected to several post-synthetic modifications to access highly functionalized molecules.
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