Abstract Hydromagnesiation of 3-trimethylsilyl-2-propyn-1-o1 (1) followed by reaction with aldehydes or ketones affords (E)-3-trimethylsilyl-2-alken-1, 4-diols (2), which can be readily dehydrated to 3-trimethylsilyl-2, 5-dihydrofurans (3) by treatment with BF 3 OEt 2. The compounds (3) are converted to furans (5) by epoxidation and subsequent treatment with H 2 SO 4.
