(S)-2-((tert-Butoxycarbonyl)amino)-4,4-dimethylpentanoic acid → (3aR,4S,7aR)-4-((S)-2-tert-butoxycarbonylamino-4,4-dimethyl-pentanoyloxy)-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester

HRID 2176757Notes

Reaction equation

HRID 2176757 reaction equation
[CH3:1][O:2][C:3]([N:5]1[C@@H:13]2[C@@H:8]([C@@:9]([OH:23])([C:14]#[C:15][C:16]3[CH:17]=[C:18]([CH3:22])[CH:19]=[CH:20][CH:21]=3)[CH2:10][CH2:11][CH2:12]2)[CH2:7][CH2:6]1)=[O:4].[C:24]([O:28][C:29]([NH:31][C@@H:32]([CH2:36][C:37]([CH3:40])([CH3:39])[CH3:38])[C:33](O)=[O:34])=[O:30])([CH3:27])([CH3:26])[CH3:25]>>[CH3:1][O:2][C:3]([N:5]1[C@H:13]2[C@H:8]([C@:9]([O:23][C:33](=[O:34])[C@@H:32]([NH:31][C:29]([O:28][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:30])[CH2:36][C:37]([CH3:40])([CH3:39])[CH3:38])([C:14]#[C:15][C:16]3[CH:17]=[C:18]([CH3:22])[CH:19]=[CH:20][CH:21]=3)[CH2:10][CH2:11][CH2:12]2)[CH2:7][CH2:6]1)=[O:4]

Participants

3

Reactant 2

HCID 2755926(S)-2-((tert-Butoxycarbonyl)amino)-4,4-dimethylpentanoic acidHCID 68276168(3aS,4R,7aS)-4-hydroxy-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester

Product 1

HCID 86702178(3aR,4S,7aR)-4-((S)-2-tert-butoxycarbonylamino-4,4-dimethyl-pentanoyloxy)-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester

Procedure

Synthesis in analogy to the General Method 1 starting from (3aS,4R,7aS)-4-hydroxy-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester and (S)-2-tert-butoxycarbonylamino-4,4-dimethyl-pentanoic acid to yield (3aR,4S,7aR)-4-((S)-2-tert-butoxycarbonylamino-4,4-dimethyl-pentanoyloxy)-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester. This NBoc-protected product was then stirred in hydrochloric acid dioxane solution (4M, 10 equiv.) at room temperature for 6 hrs. Subsequently the solvent was removed the residue dissolved in dichloromethane and washed with saturated sodium hydrogencarbonate solution. The organic layer was tried with sodium sulfate, filtrated and evaporated. The crude product was subjected to silica gel flash chromatography (ISCO CombiFlash; dichloromethane/methanol; 100/0 to 95/5) to yield (3aR,4S,7aR)-4-((S)-2-amino-4,4-dimethyl-pentanoyloxy)-4-m-tolylethynyl-octahydro-indole-1-carboxylic acid methyl ester. MS [M+H] 296 (ester elimination ion); RT=5.787 min; HPLC Method I

Sources & evidence

ORD record
ord-3e9ac19f400d4f99a7d484aec4f0ed42
Source dataset
uspto-grants-2015_06
Patent number
US09067881B2

Reaction notes

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