1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (14S,18S)-tri-tert-butyl 1-(1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)-8,16-dioxo-2-(4-(prop-2-yn-1-yloxy)benzyl)-2,9,15,17-tetraazaicosane-14,18,20-tricarboxylate

Participants

Role	Name	HCID	Charge
Reactant	1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide	HCID 15908	—
Reactant	1-Hydroxybenzotriazole	HCID 75771	—
Reactant	Diisopropylethylamine	HCID 81531	—
Reactant	1,5-Bis(1,1-dimethylethyl) N-((((1S)-5-amino-1-((1,1-dimethylethoxy)carbonyl)pentyl)amino)carbonyl)-L-glutamate	HCID 25194225	—
Reactant	6-(((1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)methyl)(4-(prop-2-yn-1-yloxy)benzyl)amino)hexanoic acid	HCID 86676476	—
Solvent	1,2-Dichloroethane	HCID 11	—
Product	(14S,18S)-tri-tert-butyl 1-(1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)-8,16-dioxo-2-(4-(prop-2-yn-1-yloxy)benzyl)-2,9,15,17-tetraazaicosane-14,18,20-tricarboxylate	HCID 86676477	57.1%

Reaction Steps

A solution of (S)-di-tert-butyl 2-(3-((S)-6-amino-1-(tert-butoxy)-1-oxohexan-2-yl)ureido)pentanedioate (0.480 g, 1.0 mmol), 6-(((1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)methyl)(4-(prop-2-yn-1-yloxy)benzyl)amino)hexanoic acid (0.220 g, 0.468 mmol), EDCI (0.191 g, 1.0 mmol), HOBt (0.135 g, 1.0 mmol) and DIPEA (0.40 mL) in DCE (10.0 mL) was stirred at room temperature for 3 h. The solvent was evaporated to give a residue, which was purified by Biotage eluting with DCM/MeOH to give (14S,18S)-tri-tert-butyl 1-(1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)-8,16-dioxo-2-(4-(prop-2-yn-1-yloxy)benzyl)-2,9,15,17-tetraazaicosane-14,18,20-tricarboxylate (0.251 g, 57%). MS (ESI), 939.5 (M+H)+.

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US08926944B2
Source dataset	uspto-grants-2015_01
ORD ID	ord-ee1e85950eaf4080bfc16e10826a8fac
Source note	uspto-grants-2015_01