Water → 3-[(1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(hydroxymethyl)-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-1,2,3,4,5,6,7,7a,11,11b,12,13,13a,13b-tetradecahydrocyclopenta[a]chrysen-9-yl]-1H-pyrazole-5-carboxylic acid

HRID 406887Notes

Reaction equation

HRID 406887 reaction equation
C([O:9][CH2:10][C@:11]12[CH2:46][CH2:45][C@@H:44]([C:47]([CH3:49])=[CH2:48])[C@@H:12]1[C@@H:13]1[C@@:26]([CH3:29])([CH2:27][CH2:28]2)[C@@:25]2([CH3:30])[C@@H:16]([C@:17]3([CH3:43])[C@@H:22]([CH2:23][CH2:24]2)[C:21]([CH3:32])([CH3:31])[C:20]([C:33]2[CH:37]=[C:36]([C:38]([O:40]CC)=[O:39])[NH:35][N:34]=2)=[CH:19][CH2:18]3)[CH2:15][CH2:14]1)(=O)C1C=CC=CC=1.O.O.[OH-].[Li+]>O1CCOCC1>[OH:9][CH2:10][C@:11]12[CH2:46][CH2:45][C@@H:44]([C:47]([CH3:49])=[CH2:48])[C@@H:12]1[C@@H:13]1[C@@:26]([CH3:29])([CH2:27][CH2:28]2)[C@@:25]2([CH3:30])[C@@H:16]([C@:17]3([CH3:43])[C@@H:22]([CH2:23][CH2:24]2)[C:21]([CH3:31])([CH3:32])[C:20]([C:33]2[CH:37]=[C:36]([C:38]([OH:40])=[O:39])[NH:35][N:34]=2)=[CH:19][CH2:18]3)[CH2:15][CH2:14]1

Participants

5

Reactant 3

HCID 962WaterHCID 168937Lithium hydroxide, monohydrateHCID 67776421HCID 67776421, compound

Product 1

HCID 547608823-[(1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(hydroxymethyl)-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-1,2,3,4,5,6,7,7a,11,11b,12,13,13a,13b-tetradecahydrocyclopenta[a]chrysen-9-yl]-1H-pyrazole-5-carboxylic acidYield 49.5%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Conditions

Temperature
75 °C

Procedure

To a solution of ethyl 3-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(benzoyloxymethyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)-1H-pyrazole-5-carboxylate (0.07 g, 0.105 mmol) in 1,4-Dioxane (4 mL) was added Water (1 mL) and lithium hydroxide monohydrate (0.085 g, 2.026 mmol). The mixture was heated to 75° C. for 18.25 h, was cooled to rt, and was quenched with 1N HCl (7 mL). The mixture was extracted with dichloromethane (4×7 mL) and the combined organic layers were dried with Na2SO4. The drying agent was removed by filtration and the filtrate was concentrated under reduced pressure. Purification was accomplished by crystallization from dioxane and water to give 3-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(hydroxymethyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)-1H-pyrazole-5-carboxylic acid (0.03 g, 0.052 mmol, 49.2% yield) as a white solid. LCMS: m/e 533.60 (M−H)−, 1.24 min (method 1). 1H NMR (500 MHz, Pyr) δ ppm 0.86 (t, J=7.48 Hz, 3H), 0.95 (s, 3H), 1.06 (s, 6H), 1.06-1.99 (m, 22H), 1.80 (s, 3H), 2.14-2.24 (m, 2H), 2.40-2.51 (m, 2H), 2.65 (dt, J=10.99, 5.49 Hz, 1H), 3.69 (d, J=10.68 Hz, 1H), 4.12 (d, J=10.68 Hz, 1H), 4.79 (s, 1H), 4.93 (d, J=2.14 Hz, 1H), 6.13 (br. s., 1H), 7.33 (s, 1H).

Workup

  1. temperaturewas cooled to rt
  2. customwas quenched with 1N HCl (7 mL)
  3. extractionThe mixture was extracted with dichloromethane (4×7 mL)
  4. dry with materialthe combined organic layers were dried with Na2SO4
  5. customThe drying agent was removed by filtration
  6. concentrationthe filtrate was concentrated under reduced pressure
  7. customPurification
  8. customwas accomplished by crystallization from dioxane and water

Sources & evidence

ORD record
ord-84fe6f6241a548f894c4745be15f5442
Source dataset
uspto-grants-2014_06
Patent number
US08754068B2

Reaction notes

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