Réaction #1483086

Équation de réaction

DDAIP

4

dodecyl 2-(dimethylamino)propanoate

citric acid

→

dodecyl 2-(dimethylamino)propanoate citrate salt

Rendement 95.6%

Solvants

methanol

Conditions de réaction

Traitement

1. 1
   workup.ADDITIONAfter addition
2. 2
   ConcentrationThe solvent was concentrated under vacuum
3. 3
   workup.ADDITIONThe residue was diluted with n-hexane (100 mL) which
4. 4
   AutreSome seeding material was prepared (

Mode opératoire

A stirred solution of DDAIP base 4 (75 g, 263 mmol) in methanol (600 mL) was cooled to 0° C. then citric acid 8 (50.4 g, 0.263) was added in one lot. After addition, the temperature of the reaction mixture was slowly raised to RT, stirred at RT for 12 h, and the reaction mixture was monitored by TLC. The solvent was concentrated under vacuum. The residue was diluted with n-hexane (100 mL) which was not miscible with the product. Some seeding material was prepared (scratching the crude in a glass vial), and seeded to the crude to afford dodecyl 2-(dimethylamino)propanoate citrate salt (11, Nex-07) (120 g, yield: 95.6%) as a white solid, mp: 62-67° C. 1H-NMR (400 MHz, CDCl3): δ 0.85 (t, 3H), 1.3 (m, 18H), 1.5 (d, 3H), 1.7 (q, 2H), 2.7 (m, 2H), 2.9 (s, 6H), 4.1 (q, 1H), 4.2 (t, 2H); LCMS: 286 (M++1); HPLC: 88%.

Source