Triethylamine → methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-isocyanato-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)benzoate

HRID 338627Notes

Reaction equation

HRID 338627 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[C:12]([CH3:42])([CH3:41])[C@H:13]3[C@:26]([CH3:29])([CH2:27][CH:28]=2)[C@@H:25]2[C@:16]([CH3:40])([C@@:17]4([CH3:39])[C@H:22]([CH2:23][CH2:24]2)[C@H:21]2[C@H:30]([C:33]([CH3:35])=[CH2:34])[CH2:31][CH2:32][C@:20]2(C(O)=O)[CH2:19][CH2:18]4)[CH2:15][CH2:14]3)=[CH:7][CH:6]=1)=[O:4].C([N:45]([CH2:48]C)CC)C.C1(P(N=[N+]=[N-])(C2C=CC=CC=2)=[O:57])C=CC=CC=1>O1CCOCC1.CCOC(C)=O>[N:45]([C@:20]12[CH2:32][CH2:31][C@@H:30]([C:33]([CH3:35])=[CH2:34])[C@@H:21]1[C@@H:22]1[C@@:17]([CH3:39])([CH2:18][CH2:19]2)[C@@:16]2([CH3:40])[C@@H:25]([C@:26]3([CH3:29])[C@@H:13]([CH2:14][CH2:15]2)[C:12]([CH3:41])([CH3:42])[C:11]([C:8]2[CH:9]=[CH:10][C:5]([C:3]([O:2][CH3:1])=[O:4])=[CH:6][CH:7]=2)=[CH:28][CH2:27]3)[CH2:24][CH2:23]1)=[C:48]=[O:57]

Participants

6

Reactant 3

HCID 8471TriethylamineHCID 199401P,P-Diphenylphosphinic azideHCID 54759950(1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-1-isopropenyl-9-(4-methoxycarbonylphenyl)-5a,5b,8,8,11a-pentamethyl-1,2,3,4,5,6,7,7a,11,11b,12,13,13a,13b-tetradecahydrocyclopenta[a]chrysene-3a-carboxylic acid

Product 1

HCID 86676572methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-isocyanato-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)benzoateYield 86.4%

Reagents, catalysts & solvents 2

HCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

To a slurry of (1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-9-(4-(methoxycarbonyl)phenyl)-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]chrysene-3a-carboxylic acid (10 g, 17.46 mmol) in 1,4-dioxane (200 mL) was added triethylamine (4.38 mL, 31.4 mmol) followed by diphenyl phosphoryl azide (5.82 mL, 26.2 mmol). The resulting white slurry was heated to 100° C. After 5 h, the reaction was allowed to cool to rt and was then diluted with EtOAc and washed with 1N NaOH (2×70 mL). The combined aqueous layer was extracted with EtOAc (2×150 mL). The combined organic layer was dried over Na2SO4, filtered and concentrated to slurry (about 75 mL) which was stored in a refrigerator overnight. The slurry was filtered and the white solid product was washed with Et2O. The liquid filtrate was concentrated to yellow slurry which was filtered and washed with Et2O to give more white solid product. The two batches of white solid were combined and dried under reduced pressure to give methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-isocyanato-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)benzoate (8.6 g, 86% yield) as a white solid. 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 8.0 (2H, d, J=8.2 Hz), 7.2 (2H, d, J=8.2 Hz), 5.3 (1H, d, J=4.6 Hz), 4.8 (1H, s), 4.7 (1H, s), 3.9 (3H, s), 2.6 (1H, td, J=10.8, 5.8 Hz), 2.1-2.2 (2H, m), 1.8-2.0 (4H, m), 1.7-1.8 (1H, m), 1.7 (3H, s), 1.5-1.7 (5H, m), 1.4-1.5 (5H, m), 1.3-1.4 (2H, m), 1.2-1.3 (2H, m), 1.1 (3H, s), 1.1-1.1 (1H, m), 1.0 (3H, s), 1.0 (3H, s), 1.0 (3H, br. s.), 1.0 (3H, br. s.). 13C NMR (CHLOROFORM-d) δ ppm 14.2, 15.4, 16.2, 19.2, 19.5, 20.8, 21.0, 24.7, 27.4, 29.0, 29.2, 33.3, 36.0, 37.2, 39.0, 39.0, 40.3, 41.5, 41.8, 47.8, 49.0, 49.2, 51.7, 52.6, 66.8, 71.3, 110.2, 121.3, 123.7, 127.6, 128.2, 129.8, 146.0, 148.4, 148.6, 166.9.

Workup

  1. temperatureto cool to rt
  2. washwashed with 1N NaOH (2×70 mL)
  3. extractionThe combined aqueous layer was extracted with EtOAc (2×150 mL)
  4. dry with materialThe combined organic layer was dried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customwas stored in a refrigerator overnight
  8. filtrationThe slurry was filtered
  9. washthe white solid product was washed with Et2O
  10. concentrationThe liquid filtrate was concentrated to yellow slurry which
  11. filtrationwas filtered
  12. washwashed with Et2O
  13. customto give more white solid product
  14. customdried under reduced pressure

Sources & evidence

ORD record
ord-b3723b85a39e47c884cb1a698cb8cf9e
Source dataset
uspto-grants-2014_11
Patent number
US08889854B2

Reaction notes

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