反应详情

Solid cholesterol chloroformate (10 mmol) was dissolved in 100 mL of dichloromethane (DCM). In a separate flask 0.5 mol ethylenediamine was diluted with 200 mL of DCM and 20 mmol diisopropylethylamine. While stirring, the cholesterol chloroformate solution was drop-wise added to the ethylenediamine solution over a 30 minute period at room temperature (R.T.). Following an overnight R.T. stir, organic solvent was roto-evaporated away using medium vacuum until a minimal sample volume remained. Approximately 400 mL of acetonitrile was added to precipitate the crude product. The solid was then collected by filtration onto a Whatman #5 filter apparatus, rinsed several times with acetonitrile and then air-dried. The crude solid was dissolved in a minimal volume of chloroform and chromatographically purified using a silica column. The purified product presented a single TLC spot (4:1 chloroform/methanol), and a single peak (parent ion M+H=474) was identified by positive mode electrospray.

1. stirringstir
2. customorganic solvent was roto-evaporated away
3. additionApproximately 400 mL of acetonitrile was added
4. customto precipitate the crude product
5. filtrationThe solid was then collected by filtration onto a Whatman #5
6. filtrationfilter apparatus
7. washrinsed several times with acetonitrile
8. customair-dried
9. dissolutionThe crude solid was dissolved in a minimal volume of chloroform
10. customchromatographically purified