Reaction #168605

Reaction equation

hexane

trityl chloride

(S)-(+)-2-aminobutan-1-ol

DIEA

→

title compound

(S)-2-(Trityl-amino)-butan-1-ol

Solvents

MeOH

ether

DCM

Conditions

Workup

1. 1
   OtherThe solvent was evaporated in vacuo
2. 2
   Otherthe residue precipitated from acetone (50 mL) with hexane (900 mL)
3. 3
   workup.STIRRINGwith stirring
4. 4
   Otherthe precipitate was removed by filtration
5. 5
   Otherthe filtrate was evaporated in vacuo
6. 6
   workup.DISSOLUTIONThe residue was dissolved in hexane (1 L)
7. 7
   Filtrationfiltered
8. 8
   Otherthe filtrate was evaporated in vacuo

Procedure

To a stirred solution of (S)-(+)-2-aminobutan-1-ol (10 g, 1 eq, 112.18 mmol) in DCM (500 mL) under an argon atmosphere at room temperature, was added DIEA (30 mL, 1.54 eq, 172.22 mmol) followed by trityl chloride (35.4 mL, 1.13 eq, 126.98 mmol). The reaction mixture was stirred at this temperature for 48 h, when TLC (hexane:ether:MeOH; 55:40:5) indicated that the reaction had gone to completion. The solvent was evaporated in vacuo and the residue precipitated from acetone (50 mL) with hexane (900 mL) with stirring, the precipitate was removed by filtration and the filtrate was evaporated in vacuo. The residue was dissolved in hexane (1 L), filtered, and the filtrate was evaporated in vacuo to afford the title compound as a light yellow oil. Yield: 33 g (89%). 1H-NMR (d6-DMSO, 250 MHz): δ 0.58 (t, 3H, J=7.26 Hz, —NHCH(CH2CH3)CH2OH), 1.10 (m, 2H, —NHCH(CH2CH3)CH2OH), 2.24 (m, 1H, —NHCH(CH2CH3)CH2OH), 2.39 (m, 1H, —NHCH(CH2CH3)CH2OH), 2.76 & 3.03 (2×m, 2H, —NHCH(CH2CH3)CH2OH), 4.32 (t, 1H, J=4.97 Hz, —NHCH(CH2CH3)CH2OH), 7.15-7.52 (m, 15H, 3×Ph).

Source