反应详情

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 1-methyl-8-triethylsilanyloxymethyl-1,3-dihydro-2-thia-1,3-diaza-cyclopenta[α]naphthalene 2,2-dioxide (416 mg, 1.1 mmol) in anhydrous tetrahydrofuran (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-methyl-2,2-dioxo-8-triethylsilanyloxymethyl-1,2-dihydro-2-thia-1,3-diaza-cyclopenta[α]naphthalen-3-ylmethyl)-carbapen-2-em-3-carboxylate.

1. additionis added dropwise over a few minutes
2. washwashed with 5% aqueous sodium bicarbonate and brine
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. customevaporated under vacuum
6. customThe residue is purified by silica gel flash chromatography
7. washeluting with hexane-ethyl acetate