4
Tetrahedron Letters
References and notes
gel column chromatography. Compounds 4 and 6 were
synthesized from compound 3 using the same method.
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18 General procedure for the synthesis of 2: A sealed tube
equipped with a magnetic stirrer bar was charged with
substrate 1 (0.2 mmol, 1 equiv.), t-BuOK (0.6 mmol, 3
equiv.) and MTBE (2 mL) in a glovebox. The reaction
o
mixture was then heated to 100 C and stirred for 6 h.
After reaction completion, water (10 mL) was added to
the reaction mixture and the mixture was extracted with
ether (10 mL × 3). The collected organic extracts were
dried over Na2SO4. The solvent was removed under
reduced pressure and the residue was purified by silica