Method for preparing antimer (R)or (S)-1,1'-bi-2-naphthol
A naphthol and crystallization technology, applied in the field of chiral compound preparation chemistry, can solve problems such as high preparation cost, and achieve the effects of short preparation period, high yield and low cost
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Embodiment 1
[0019] Threo(1S,2S)-2-dimethylamino-1-(p-nitrophenyl)-1,3-propanediol and benzyl chloride were refluxed in acetone for 24 hours, then cooled and filtered to obtain (1S, 2S)-1,3-dihydroxy-1-(p-nitrophenyl)-2-(N-benzyl-N,N-dimethyl)propyl ammonium salt crude product; the mother liquor was concentrated to obtain the second product; The crude product was combined with the second product, and recrystallized with ethanol to obtain white needle-like crystals; the yield was 65%; m.p.184-187°C; 1 H NMR (d 6 -DMSO): δ3.21(s, 3H), 3.26(s, 3H), 3.73(d, 1H), 3.85(d, 1H), 4.97-5.13(m, 2H), 5.55(t, 1H), 5.89(s, 1H), 7.27(d, 1H), 7.54(d, 3H), 7.65(d, 2H), 7.76(d, 2H), 8.26(d, 2H); MS(FAB): 331(M + -Cl, 100), 315 (M + -Cl-O, 10), 239 (M + -PhCH 2 Cl-1, 8), 91 ([M PhCH2 ] + , 95).
[0020] The racemic 1,1'-bi-2-naphthol and the chiral clathrate prepared above were chlorinated (1S, 2S)-1,3-dihydroxy-1-(p-nitrophenyl)- 2-(N-benzyl-N, N-dimethyl) propylammonium salt is dissolved in aceton...
Embodiment 2
[0023] According to the method of Example 1, racemic 1,1'-bi-2-naphthol and (1S,2S)-1,3-dihydroxy-1-(p-nitrogen chloride) were mixed in a molar ratio of 1:0.5 phenyl)-2-(N-benzyl-N, N-dimethyl) propylammonium salt in methanol (the amount of methanol is racemic 1,1 '-linked-2-naphthol weight of 5- 20 times), mixed in, heated to dissolve and then cooled to precipitate clathrate crystals. This crystal was stirred in dilute hydrochloric acid and chloroform mixed solution, separated the organic phase, dried, evaporated, and recrystallized to give (S)-1,1'-bi-2-naphthol block crystals, yield, About 80%, m.p 206-208°C, 100% ee. The mother liquor after separation of this crystal was treated according to the procedure of Example 1 to obtain massive, colorless and transparent (R)-1,1'-bi-2-naphthol crystals with a yield of 80-85%, m.p.206 -208°C, [α] D 20 =+35.4 (c=1 in THF), 100% ee.
Embodiment 3
[0025]According to the method of Example 1, racemic 1,1'-bi-2-naphthol and (1S,2S)-1,3-dihydroxy-1-(p-nitrogen chloride) in a molar ratio of 1:3 phenyl)-2-(N-benzyl-N,N-dimethyl)propylammonium salt in a mixture of tetrahydrofuran and water (the amount of tetrahydrofuran is racemic 1,1'-bi-2-naphthol about 15 times the weight), and then heated to dissolve and then cooled to precipitate clathrate crystals. This crystal is stirred in the mixed solution of sodium hydroxide solution and benzene, and the organic phase is separated, dried, evaporated, and recrystallized to give (S)-1,1'-bi-2-naphthol block crystals, Yield, 82%, m.p 206-208°C, 100% ee. After the clathrate crystals were separated, the mother liquor was concentrated and cooled to room temperature, and massive, colorless and transparent (R)-1,1'-bi-2-naphthol crystals were precipitated, with a yield of about 85%, m.p.206-208 °C, [α] D 20 ==+35.4 (c=1 in THF), 100% ee.
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