Pyridine → HCID 12960803, compound

Participants

Reaction Steps

Chromium trioxide (145 g., 1.45 mol) was added to 5 l. of methylene chloride in a 12 l. round bottomed flask fitted with argon inlet and mechanical stirrer. Pyridine (230 ml., 2.9 mol) was added and the mixture was stirred for 2 hours. Celite (290 g.) was added and then E-4,4-dimethoxy-2-fluoro-3-methyl-buten-1-ol was added in one portion and stirred for 30 minutes. The mixture was filtered, evaporated at 30° C. to ~5% of its volume and diluted with 500 ml. of ether. This mixture was filtered and evaporated to ~100 ml. at 30° C. The resulting E-4,4-dimethoxy-2-fluoro-3-methyl-buten-1-al was used in the next step without further purification.

Provenance & Evidence