تفاعل #2266968

معادلة التفاعل

(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-N-((1R,3S)-3-((4-ethylpiperazin-1-yl)methyl)cyclopentyl)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxamide

pyridine

3,3-dimethyldihydrofuran-2,5-dione

→

title compound

4-((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-3a-((1R,3S)-3-((4-ethylpiperazin-1-yl)methyl)cyclopentylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid

المذيبات

ethyl acetate

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe contents were refluxed for about 16 hours
2. 2
   غسيلThe organic layer was washed with 5% aqueous HCl
3. 3
   غسيلwashed with water
4. 4
   تجفيفdried over Na2SO4
5. 5
   تركيزconcentrated under reduced pressure
6. 6
   أخرىThe residue was purified by silica gel column chromatography

الإجراء التجريبي

To a stirred solution of (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-N-((1R,3S)-3-((4-ethylpiperazin-1-yl)methyl)cyclopentyl)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxamide (Example 35, 0.24 mmol) in pyridine (5 ml) dimethyl amino pyridine (0.32 g, 0.48 mmol) and 3,3-dimethyldihydrofuran-2,5-dione (1.3 ml) were added and the contents were refluxed for about 16 hours and completion of the reaction was monitored by TLC. The reaction mixture was diluted with ethyl acetate (30 ml). The organic layer was washed with 5% aqueous HCl, washed with water followed by brine solution, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by silica gel column chromatography using 5% MeOH in DCM as eluent to furnish the title compound (0.1 g) as a white solid. 1H NMR (300 MHz, CDCl3): 0.80-0.95 (m, 16H) 1.23-1.90 (m, 41H); 2.03-3.08 (m, 16H), 4.13-4.18 (m, 1H), 4.46 (s, 1H), 4.58 (s, 1H), 4.72 (s, 1H); 5.61-5.63 (m, 1H); ES Mass: [M+1] 778 (100%); HPLC: 78.4%.

المصدر