HCID 87359941, compound → HCID 67332711, compound

Participants

Reaction Steps

A solution of methylmagnesiumbromide (1.4 M THF/toluene, 210 mL, 295 mmol) was added to THF (150 mL) and copper (I) chloride (2.92 g, 29.5 mmol) was added. After stirring at room temperature for ½ hr, a solution of the epoxide (Compound 5, 16.26 g 46.99 mmol) in THF (450 mL) was added dropwise over 5 min. The mixture was stirred at room temperature for 3 hr. The mixture was diluted with saturated ammonium chloride solution and air was bubbled through the mixture for ½ hr to oxidize Cu(I) to Cu(II). The aqueous mixture was extracted with ether (3×). The ether extracts were washed with water and brine, combined, and dried over sodium sulfate. Evaporation of the solvent gave 16.70 g of a yellow semi-solid. The material was triturated with ether and the solid was filtered to afford 8.86 g of a mixture of Grignard products (7α,11α-dimethyl and 7α,11β-dimethyl, referred to as Compounds 6a and 6b, respectively). Evaporation of the filtrate gave 7.4 g of a stable foam. Total amount was 16.26 g in quantitative yield.

Provenance & Evidence