ChemicalBook CAS DataBase List BOC-VAL-NH2

BOC-VAL-NH2 synthesis

11synthesis methods

Product Name:BOC-VAL-NH2
CAS Number:35150-08-4
Molecular formula:C10H20N2O3
Molecular Weight:216.28

13734-41-3
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35150-08-4
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$11.00/250mg

Yield: 98%

Reaction Conditions:

Stage #1:t-Boc-L-valine with chloroformic acid ethyl ester;triethylamine in tetrahydrofuran at 0; for 0.5 h;
Stage #2: with ammonium chloride in tetrahydrofuran;water at 0; for 0.5 h;

Steps:

4.3.11 4.3. Typical procedure for the primary amidation of Cbz-l-Phe-OH 3a with NH4Cl
General procedure: To a colorless solution of 150mg (0.50mmol) of Cbz-L-Phe-OH 3a in 10mL of THF were added 67μL (0.70mmol, 1.4equiv) of ClCO₂Et and 209μL (1.5mmol, 3.0equiv) of Et₃N at 0°C.
After stirring for 30min at 0°C, 0.75 ml of a 1.0M aqueous solution of NH₄Cl (0.75mmol, 1.5equiv) were added at 0°C to the colorless suspension.
The mixture was stirred for 30min at 0°C and 5mL of H₂O was added to the resulted mixture.
The colorless clear solution was extracted with 30mL of EtOAc and the aqueous layer was extracted with 20mL of EtOAc.
The organic layers were combined, washed with 5mL of brine, and dried over anhydrous MgSO₄.
The crude product was chromatographed on silica gel with EtOAc to afford 129mg (86% yield) of Cbz-L-Phe-NH₂ 4a. 4.3.11
Boc-l-Val-NH₂ 4f
106 mg (98%); >99% ee; coloress solid; mp: 149-152 °C; [α]³⁰_D = -2.4 (c 1.00, MeOH); ¹H NMR (400 MHz, CDCl₃): δ 0.94 (d, J = 6.8 Hz, 3H, CH₃CH), 0.99 (d, J = 6.8 Hz, 3H, CH₃CH), 1.45 (s, 9H, (CH₃)₃C), 2.16 (ddd, J = 6.7, 6.8, 6.8 Hz, 1H, CH(CH₃)₂), 3.96 (dd, J = 6.7, 7.8 Hz, 1H, CHCO), 5.03, 5.42, 5.89 (br, br, br, 1H, 1H, 1H, NH, NH₂); ¹³C NMR (100 MHz, CDCl₃): δ 17.8, 19.3, 28.3, 30.8, 59.5, 79.9, 156.0, 174.4; IR (KBr, v_max/cm^-1): 3386 (CONH), 3345 (CONH), 3205 (CONH), 1680 (CON), 1641 (CON); HRMS (ESI-TOF): Calcd for C₁₀H₂₀N₂O₃Na (M+Na)⁺: 239.1366, found: 239.1340; The enantiomeric ratio was determined by HPLC (Chiralcel OD: hexane/2-propanol = 95/5): T_r 9.4 min.