3-(1-Methyl-1h-imidazol-2-yl)propanoic acid → 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-5a,5b,8,8,11a-pentamethyl-3a-(3-(1-methyl-1H-imidazol-2-yl)propanamido)-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)benzoic acid

HRID 85571Notes

Reaction equation

N[C@]12CC[C@@H](C(C)=C)[C@@H]1[C@@H]1[C@@](C)(CC2)[C@@]2(C)[C@@H]([C@]3(C)[C@@H](CC2)C(C)(C)C(C2C=CC(C(OC)=O)=CC=2)=CC3)CC1.CN(C)CC[C:45]([NH:47][C@:48]12[CH2:82][CH2:81][C@@H:80]([C:83]([CH3:85])=[CH2:84])[C@@H:49]1[C@@H:50]1[C@@:63]([CH3:66])([CH2:64][CH2:65]2)[C@@:62]2([CH3:67])[C@@H:53]([C@:54]3([CH3:79])[C@@H:59]([CH2:60][CH2:61]2)[C:58]([CH3:69])([CH3:68])[C:57]([C:70]2[CH:78]=[CH:77][C:73]([C:74]([OH:76])=[O:75])=[CH:72][CH:71]=2)=[CH:56][CH2:55]3)[CH2:52][CH2:51]1)=[O:46].[CH3:87][N:88]1[CH:92]=[CH:91][N:90]=[C:89]1[CH2:93][CH2:94]C(O)=O>>[CH3:66][C@:63]12[C@@:62]3([CH3:67])[C@@H:53]([C@:54]4([CH3:79])[C@@H:59]([CH2:60][CH2:61]3)[C:58]([CH3:69])([CH3:68])[C:57]([C:70]3[CH:71]=[CH:72][C:73]([C:74]([OH:76])=[O:75])=[CH:77][CH:78]=3)=[CH:56][CH2:55]4)[CH2:52][CH2:51][C@@H:50]1[C@H:49]1[C@H:80]([C:83]([CH3:85])=[CH2:84])[CH2:81][CH2:82][C@:48]1([NH:47][C:45](=[O:46])[CH2:94][CH2:93][C:89]1[N:88]([CH3:87])[CH:92]=[CH:91][N:90]=1)[CH2:65][CH2:64]2

Participants

Reactant 3

HCID 177503733-(1-Methyl-1h-imidazol-2-yl)propanoic acid

HCID 683578604-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(3-(dimethylamino)propanamido)-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)benzoic acid

HCID 68357865methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-amino-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-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

Product 1

HCID 683580644-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-5a,5b,8,8,11a-pentamethyl-3a-(3-(1-methyl-1H-imidazol-2-yl)propanamido)-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)benzoic acidYield 29%

Procedure

The title compound was prepared in 29% yield from methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-amino-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 following the same procedure as described for the preparation of 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(3-(dimethylamino)propanamido)-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)benzoic acid, except 3-(1-methyl-1H-imidazol-2-yl)propanoic acid was used instead of 3-(dimethylamino)propionic acid hydrochloride in Step 1. LCMS: m/e 666.4 (M+H)+, 4.15 min (method 8). 1H NMR (500 MHz, METHANOL-d4) δ=7.95 (d, J=8.5 Hz, 2H), 7.53-7.46 (m, 2H), 7.25 (d, J=8.2 Hz, 2H), 5.33 (dd, J=1.8, 6.1 Hz, 1H), 4.79 (d, J=1.5 Hz, 1H), 4.66 (s, 1H), 3.91 (s, 3H), 3.30-3.18 (m, 2H), 2.84-2.79 (m, 2H), 2.73 (dt, J=5.2, 11.1 Hz, 1H), 2.64 (d, J=12.5 Hz, 1H), 2.35 (dd, J=8.2, 12.2 Hz, 1H), 2.18 (dd, J=6.4, 17.4 Hz, 1H), 1.96 (dt, J=3.2, 12.1 Hz, 1H), 1.91-1.78 (m, 2H), 1.77 (s, 1H), 1.74 (s, 3H), 1.71-1.66 (m, 1H), 1.60 (br. s., 2H), 1.46-1.26 (m, 7H), 1.22-1.13 (m, 1H), 1.11 (s, 3H), 1.07 (s, 3H), 1.05 (s, 4H), 0.99 (s, 3H), 0.97 (s, 3H).

Workup

customm/e 666.4 (M+H)+, 4.15 min (method 8)

Sources & evidence

ORD record: ord-be2f36f6049d46d7b3a5b30c6830d612
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08846647B2

Reaction notes

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