Triphenylphosphine → HCID 15542667, compound

Participants

Reaction Steps

A solution of allyl (1S,5R,6S)-6-[1(R)-allyloxycarbonyloxy-ethyl]-2-hydroxymethyl-1-methyl-carbapen-2-em-3-carboxylate (365 mg, 1.0 mmol), triphenylphosphine (315 mg, 1.2 mmol), and 7-(2-triethylsilanyloxy-ethyl)-1,1-dioxo-2,3-dihydro-naphtho[1,8-de][1,2]thiazin-3-one (431 mg, 1.1 mmol) in anhydrous tetrahydrofuiran (7 mL) is cooled in an ice-bath and stirred under a nitrogen atmosphere while diisopropyl azodicarboxylate (0.24 mL, 1.2 mmol) is added dropwise over a few minutes. The resulting solution is stirred in the cold for 30 minutes, then diluted with chloroform, washed with 5% aqueous sodium bicarbonate and brine, dried over sodium sulfate, filtered and evaporated under vacuum. The residue is purified by silica gel flash chromatography, eluting with hexane-ethyl acetate, to afford allyl (1S,5R,6S)-6-[1(R)-allyloxycarbonyloxy-ethyl]-1-methyl-2-[1,1,3-trioxo-7-(2-triethylsilanyloxy-ethyl)-2,3-dihydro-naphtho[1,8-de][1,2]thiazin-2-ylmethyl]-carbapen-2-em-3-carboxylate.

Provenance & Evidence