Diisopropylethylamine → {(3S,5S)-1-{(S)-2-[(S)-2-(tert-Butoxycarbonyl-methyl-amino)-propionylamino]-2-cyclohexyl-acetyl}-5-[(R)-(1,2,3,4-tetrahydro-naphthalen-1-yl)carbamoyl]-pyrrolidin-3-yl}-carbamic acid 9H-fluoren-9-ylmethyl ester

https://huagongshe.com/reaction/1481914

Participants

Role	Name	HCID	Charge
Reactant	Diisopropylethylamine	HCID 81531	—
Reactant	(2S)-2-(((tert-butoxy)carbonyl)(methyl)amino)propanoic acid	HCID 7009590	—
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	{(3S,5S)-1-((S)-2-amino-2-cyclohexyl-acetyl)-5-[(R)-(1,2,3,4-tetrahydro-naphthalen-1-yl)carbamoyl]-pyrrolidin-3-yl}-carbamic acid 9H-fluoren-9-ylmethyl ester	HCID 118677380	—
Solvent	Dimethylformamide	HCID 6228	—
Solvent	Ethyl Acetate	HCID 8857	—
Product	{(3S,5S)-1-{(S)-2-[(S)-2-(tert-Butoxycarbonyl-methyl-amino)-propionylamino]-2-cyclohexyl-acetyl}-5-[(R)-(1,2,3,4-tetrahydro-naphthalen-1-yl)carbamoyl]-pyrrolidin-3-yl}-carbamic acid 9H-fluoren-9-ylmethyl ester	HCID 90220982	—

Reaction Conditions

Temperature	0 °C

Reaction Steps

To a stirred solution of Boc-N-Me-Ala-OH (2.55 g, 12.57 mmol) in DMF (30 mL) were added HATU (4.78 g, 12.57 mmol) and DIPEA (9.9 mL, 57.16 mmol). After 30 min, the mixture was cooled to 0° C. and {(3S,5S)-1-((S)-2-amino-2-cyclohexyl-acetyl)-5-[(R)-(1,2,3,4-tetrahydro-naphthalen-1-yl)carbamoyl]-pyrrolidin-3-yl}-carbamic acid 9H-fluoren-9-ylmethyl ester (Intermediate 24) (7.5 g, 11.43 mmol) in DMF (50 mL) and the cooling bath removed. After 4 h the mixture was diluted with ethyl acetate, washed with water, dried over sodium sulfate and concentrated. The residue was purified by silica gel chromatography to afford the title compound as an off white solid (5.32 g) LC-MS: 806 (M+H).

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US09409888B2
Source dataset	uspto-grants-2016_08
ORD ID	ord-7436cab788b74d768e44b9ad011b6e48
Source note	uspto-grants-2016_08