Abstract
Prins cyclization reaction (PCR) of optically active homoallylic alcohols, R aC *H(OH)CH 2CH CHCH 3 (1-substituted but-2-en-1-ol), with aldehydes (R bCHO) in the presence of an acid-catalyst (HX) affords (2-R b,3-CH 3,4-X,6-R a)-tetrasubstituted tetrahydropyrans highly stereoselectively in good yields.
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