Borontrifluoride etherate (BF3·OEt2) can be efficiently used for the synthesis of dihydropyrans from triethylsilyl homoallylic alcohols and aldehydes in good yields. The reaction is highly diastereo- and regio-selective. Click to show full abstract
Borontrifluoride etherate (BF3·OEt2) can be efficiently used for the synthesis of dihydropyrans from triethylsilyl homoallylic alcohols and aldehydes in good yields. The reaction is highly diastereo- and regio-selective.
               
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