Sarsasapogenin derivative and preparation method as well as application thereof
A technology of smilagenin and derivatives, which is used in the application field of treating neurodegenerative diseases
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Embodiment 1
[0054] Example 1: Synthesis of (22R,25S)-3β-benzyloxy-26-piperidinyl-5β-furostane (ZA-3-6)
[0055] Synthesis of A.a: Add smilagenin (4.16g, 0.01mol) and NaH (0.48g, 0.02mol) to a 250mL eggplant-shaped bottle, add benzyl bromide (3.42g, 0.02mol) to 40mL DMF while stirring at room temperature, 40 °C and the reaction was stirred until the reaction was complete. After the reaction was complete, let it cool, then add about 10 times the amount of water, stir, and filter with suction to obtain a solid, which was recrystallized from ethanol to obtain a white solid ZA-1 (3.8 g, yield 75%). 1 H NMR (300MHz, CDCl 3 ,δ):7.35(m,2H,H-2′,6′),7.33(m,2H,H-3′,5′),7.28(m,1H,H-4′),4.51(d, J=12.3Hz, 1H, Ar-CH 2 ), 4.46 (d, J=12.3Hz, 1H, Ar-CH 2 ),4.40(m,1H,H-16),3.96(dd,J=2.6,11.0Hz,1H,H-26),3.71(br.s,1H,H-3),3.30(d,J= 11.0Hz, 1H, H-26), 1.08(d, J=7.1Hz, 3H, 27-CH 3 ),0.99(d,J=6.8Hz,3H,21-CH 3 ),0.97(s,3H,19-CH 3 ),0.76(s,3H,18-CH 3 ). 13 C NMR (100MHz, CDCl 3 ,δ):139.6,128.4,128.4,127...
Embodiment 2
[0059] Example 2: Synthesis of (22R,25S)-3β-benzyloxy-26-diethylamino-5β-furostane (ZA-3-2)
[0060] The preparation steps were the same as in Example 1, except that the reaction reagent in step D was replaced with diethylamine to obtain oil ZA-3-2 (0.34 g, 60.6%). 1 H NMR (300MHz, CDCl 3 ,δ):7.35(m,2H,H-2′,6′),7.32(m,2H,H-3′,5′),7.26(m,1H,H-4′),4.50(d, J=12.3Hz, 1H, Ar-CH 2 ), 4.45 (d, J=12.3Hz, 1H, Ar-CH 2 ),4.28(td,J=7.7&5.0Hz,1H,H-16),3.70(br.s,1H,H-3),3.30(m,1H,H-22),2.46(m,4H, N-CH 2 ),1.00(s,3H,19-CH 3 ),0.97(m,9H,3×CH 3 ), 0.90 (d, J=6.3Hz, 3H, 27-CH 3 ),0.79(s,3H,18-CH 3 ). 13 C NMR (100MHz, CDCl 3 ,δ):139.5,128.3,128.3,127.3,127.3,127.2,90.5,83.3,73.8,69.5,65.6,60.2,57.0,47.6,47.6,41.1,40.2,40.0,37.9,37.1,35.5,35.1,32.3, 31.8, 31.0, 30.8, 30.5, 26.7, 26.5, 24.7, 23.9, 20.8, 19.2, 18.5, 16.6, 11.7, 11.7. ESI-HRMS: m / z 564.4765 [M+H] + (Calcd for C 38 h 62 NO 2 ,564.4775).
Embodiment 3
[0061] Example 3: Synthesis of (22R,25S)-3β-benzyloxy-26-di-n-propylamino-5β-furostane (ZA-3-3)
[0062] The preparation steps were the same as in Example 1, except that the reaction reagent in step D was replaced with di-n-propylamine to obtain oil ZA-3-3 (0.43 g, 73.2%). 1 H NMR (400MHz, CDCl 3 ,δ):7.35(m,2H,H-2′,6′),7.32(m,2H,H-3′,5′),7.26(m,1H,H-4′),4.50(d, J=12.2Hz, 1H, Ar-CH 2 ), 4.46 (d, J=12.2Hz, 1H, Ar-CH 2 ),4.29(td,J=5.1,7.7Hz,1H,H-16),3.70(br.s,1H,H-3),3.30(m,1H,H-22),2.32(m,4H, N-CH 2 ), 0.99 (d, J=6.7Hz, 3H, 21-CH 3 ),0.97(s,3H,19-CH 3 ), 0.90 (d, J=6.4Hz, 3H, 27-CH 3 ), 0.86(t, J=7.3Hz, 6H, 2×CH 3 ),0.78(s,3H,18-CH 3 ). 13 C NMR (100MHz, CDCl 3 ,δ):139.5,128.3,128.3,127.3,127.3,127.2,90.5,83.2,73.8,69.5,65.6,61.6,57.0,56.8,56.8,41.1,40.2,40.0,37.8,37.0,35.5,35.1,32.2, 32.1, 31.8, 30.9, 30.8, 30.5, 26.7, 26.5, 24.7, 23.9, 20.8, 20.1, 20.1, 19.2, 18.4, 16.6, 12.0, 12.0. ESI-HRMS: m / z 592.5095 [M+H] + (Calcd for C 40 h 66 NO 2 ,592.5088).
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