反应详情

A sample of 1'-(1,1-dimethylethyloxycarbonyl)-3-amino-2,3-dihydrospiro(1H-indene-1,4'-piperidine), prepared by hydrogenation of 500 mg of oxime (1.58 mmole) as in Example 135, in 2 mL methylene chloride containing 475 mg of DMAP (2.46×1.58 mmole), and 550λ of triethylamine (2.51×1.58 mmole), was stirred under nitrogen in an ice bath while adding a solution of 400λ of 8.4M methyl chlorosulfonylacetate (2.13×1.58 mmole) in 2 mL methylene chloride dropwise over 2-3 minutes. The suspension was stored over night in the refrigerator. It was then washed twice with water, then with 5% citric acid. Atypically, solid material was still present in suspension; this was s removed by filtration, the filtrate dried with magnesium sulfate and concentrated under reduced pressure. Again, solid formed and was removed by filtration. Finally, preparative TLC on four 8"×8"×1,000μ GF silica gel plates using 2:1 ethyl acetate:hexane afforded 389 mg of the title compound

1. waitThe suspension was stored over night in the refrigerator
2. washIt was then washed twice with water
3. customremoved by filtration
4. dry with materialthe filtrate dried with magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customAgain, solid formed
7. customwas removed by filtration