Dicyclohexylcarbodiimide → 1,2-Pyrrolidinedicarboxylic acid, 1-(1,1-dimethylethyl) 2-(2,5-dioxo-1-pyrrolidinyl) ester, (2S)-
Reaction equation
[N:1]1([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:8][CH2:7][CH2:6][C@H:2]1[C:3]([OH:5])=[O:4].O[N:17]1[C:21](=[O:22])[CH2:20][CH2:19][C:18]1=[O:23].C1(N=C=NC2CCCCC2)CCCCC1>>[N:1]1([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:8][CH2:7][CH2:6][C@H:2]1[C:3]([O:5][N:17]1[C:21](=[O:22])[CH2:20][CH2:19][C:18]1=[O:23])=[O:4]Participants
4
Procedure
Condesation of BocProOH (6.46 g.) and N-hydroxysuccinimide (3.5 g.) using dicyclohexylcarbodiimide gave BocProOSu in 75% yield. Condensation of BocProOSu (5.0 g.) and HDPheOH (2.75 g.) by the salt coupling method gave BocPro-DPheOH in 67% yield. Condensation of BocPro-DPheOH (3.98 g.) and HPheOMe hydrochloride salt (2.4 g.) using dicyclohexylcarbodiimide and N-hydroxysuccinimide gave BocPro-DPhe-PheOMe in 74% yield. Hydrazinolysis of Boc-Pro-DPhe-PheOMe (3.14 g.) gave BocPro-DPhe-PheNHNH2 in 79% yield.
Sources & evidence
- ORD record
- ord-3095e27405ae4d28b243125d59d9e42f
- Source dataset
- uspto-grants-1984_09
- Patent number
- US04472305
Reaction notes
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