Triethylsilane → 6-Bromo-8-ethyl-2,2,4,4-tetramethyl chroman

Participants

Reaction Steps

A stirred, cooled (ice bath) solution of 8-acetyl-6-bromo-2,2,4,4-tetramethyl chroman (Intermediate 45, 0.95 g, 3.1 mmol) in trifluoroacetic acid (10 mL) was treated with triethylsilane (10 mL) and the resulting reaction mixture was allowed to warm to ambient temperature and stirred overnight. The volatiles were distilled off in vacuo and the residue was diluted with water and extracted with hexane (×2). The combined organic phase was dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to an oil which was subjected to flash column chromatography over silica gel (230-400 mesh) using hexane as the eluent to afford the title compound as a clear oil, contaminated with a small amount to triethylsilane (0.51 g, 56%).

Provenance & Evidence