Ivanova EE, Shabalin DA, Ushakov IA, Vashchenko AV, Schmidt EY, Trofimov BA. Diastereoselective synthesis of tetrahydropyrrolo[1,2-
d]oxadiazoles from functionalized Δ
1-pyrrolines and
in situ generated nitrile oxides.
Org Biomol Chem 2023;
21:1725-1736. [PMID:
36723150 DOI:
10.1039/d2ob02230c]
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Abstract
Tetrahydropyrrolo[1,2-d]oxadiazoles have been synthesized in good-to-excellent yields via the cycloaddition of nitrile oxides (in situ generated from aldoximes) to readily accessible functionalized Δ1-pyrrolines. The reaction proceeds smoothly at room temperature in a two-phase system in the presence of sodium hypochloride as an oxidant to diastereoselectively afford pharmaceutically prospective 1,2,4-oxadiazolines fused with a five-membered ring. The reaction tolerates a broad range of substrates, including those with oxidant-sensitive functional groups and competitive reaction sites.
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