Dichloromethane → (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(methylcarbamoyloxy)cyclopenta[c]-pyrane-4-carboxylic acid 4-(2-hyroxyethyl) piperazylamide

0.28 ml of piperazylethanol, 273 mg of DMAP and 461 mg of dicyclohexylcarbodiimide were added to a dichloromethane solution containing 400 mg of (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(methylcarbamoyloxy) cyclopenta [c]-pyrane-4-carboxylic acid described in Example 1 followed by stirring for 15 hours at room temperature. The reaction mixture was then extracted with dichloromethane. After washing the organic phase with saturated aqueous sodium bicarbonate and brine, it was dried over anhydrous magnesium sulfate. After distilling off the solvent under reduced pressure, the residue was purified by silica gel chromatography to obtain a colorless amorphous substance from the dichloromethane-methanol eluate in the form of (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(methylcarbamoyloxy) cyclopenta [c]-pyrane-4-carboxylic acid 4-(2-hydroxyethyl) piperazylamide (276 mg, yield: 49%). The physicochemical properties of this compound are described in Table 5, Compound No. 22.

1. extractionThe reaction mixture was then extracted with dichloromethane
2. washAfter washing the organic phase with saturated aqueous sodium bicarbonate and brine, it
3. dry with materialwas dried over anhydrous magnesium sulfate
4. distillationAfter distilling off the solvent under reduced pressure
5. customthe residue was purified by silica gel chromatography

ORD record

ord-a3e8c4d5db29434cbbc5283be2610048

Source dataset

uspto-grants-2001_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06225478B1