Diisopropylethylamine → (2S,4R)-tert-butyl 4-(2-chlorophenylsulfonyl)-2-(1-cyanocyclopropylcarbamoyl)-pyrrolidine-1-carboxylate

Participants

Role	Name	HCID	Charge
Reactant	Diisopropylethylamine	HCID 81531	—
Reactant	Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)	HCID 9886157	—
Reactant	1-Amino-1-cyclopropanecarbonitrile hydrochloride	HCID 14586363	—
Reactant	(2S,4R)-1-(tert-butoxycarbonyl)-4-(2-chlorophenylsulfonyl)pyrrolidine-2-carboxylic acid	HCID 66770538	—
Solvent	Acetonitrile	HCID 6342	—
Product	(2S,4R)-tert-butyl 4-(2-chlorophenylsulfonyl)-2-(1-cyanocyclopropylcarbamoyl)-pyrrolidine-1-carboxylate	HCID 66771127	66%

Reaction Steps

The carboxylic acid 5A (195 mg, 0.5 mmol), 1-aminocyclopropanecarbonitrile hydrochloride (65.2 mg, 550 μmol), HATU (380 mg, 1.00 mmol) and ethyldiisopropyl amine (262 μL, 1.5 mmol) were dissolved in acetonitrile (10 mL) and stirred at room temperature over night. The reaction was concentrated under reduced pressure. The residue was diluted with 5% aqueous sodium carbonate solution and extracted twice with ethyl acetate. The combined organic layers were washed with 1M aqueous hydrogen chloride solution and with saturated aqueous sodium chloride solution, dried over Na2SO4, filtered and concentrated under reduced pressure to yield (2S,4R)-tert-butyl 4-(2-chlorophenylsulfonyl)-2-(1-cyanocyclopropylcarbamoyl)-pyrrolidine-1-carboxylate 6H as a yellow oil (66%). MS ISP (m/e): 354.2 (100) [(M−BOC+H)]+, 398.1 (25) [(M-Isobutylene+H)]+, 454.1 (12) [(M+H)]+.

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US08802665B2
Source dataset	uspto-grants-2014_08
ORD ID	ord-68fd3d74e61048e2b36775a159567101
Source note	uspto-grants-2014_08