1,4-Dioxaspiro[4.5]decan-8-one → 8-(2,2,3,3-Tetrafluoro-2,3-dihydrobenzofuran-7-ylmethylene)-1,4-dioxaspiro[4.5]decane

Participants

Reaction Steps

This compound is prepared in a manner analogous to that of Step B of Example 2, using 20.1 grams (0.039 mole) of (2,2,3,3-tetrafluoro-2,3-dihydrobenzofuran-7-ylmethyl)triphenylphosphonium bromide, 15.4 mL (0.039 mole) of n-butyllithium (2.5M in hexanes), and 5.0 grams (0.032 mole) of 1,4-cyclohexanedione mono-ethylene ketal in about 55 mL of dry tetrahydrofuran, yielding 8-(2,2,3,3-tetrafluoro-2,3-dihydrobenzofuran-7-ylmethylene)-1,4-dioxaspiro[4.5]decane.

Provenance & Evidence