Diastereoselective synthesis of vicinal cis-dihydroxyheterospirocycles by one-pot epoxidation/spirocyclization of C(3)-functionalized cyclohex-2-en-1-ols
Abstract:Spirolactones, spirotetrahydrofurans, and spiropyrrolidines containing a vicinal cis-diol adjacent to the spiro-carbon center are prepared by one-pot epoxidation/spirocyclization of cyclohex-2-en-1-ols bearing an ester, alcohol, or amide functional side chain at the C(3) position of the ring.
A range of 1-azaspirocycles, spiroaminals and 1,6-diazaspirocycles has been synthesized, starting from simple and readily accessible furan precursors, using a cascade reaction sequence initiated by singlet oxygen.
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