Semicarbazide dihydroartemisinin derivative as well as preparation method and application of semicarbazide dihydroartemisinin derivative
A technology of semicarbazide dihydroartemisinin and derivatives, which is applied in the field of semicarbazide dihydroartemisinin derivatives and their preparation and application, and can solve the problems of less research on the modification of dihydroartemisinin
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Embodiment 1
[0023] (3R, 5aS, 6R, 8aS, 9R, 12S, 12aR)-octahydro-3-(aminothiocarbazido)methylene-6,9-dimethyl-3,12-oxo-12H - Preparation of pyrano[4,3-j]-1,2-benzodithiapine-10(3H)alcohol (1)
[0024] The structure of compound (1) is shown below:
[0025]
[0026] Add 3.62 g (0.01 mol) of (3R, 5aS, 6R, 8aS, 9R, 12S, 12aR)-octahydro-3-bromomethylene-6,9-dimethyl-3,12 to the dry reactor -Oxo-12H-pyrano[4,3-j]-1,2-benzodithiapine-10(3H)alcohol and 20mLTHF, stirred, added 1.58g (0.02mol) of pyridine and 1.09g (0.012 mol) thiosemicarbazide, reacted for 12 hours, and evaporated the solvent under reduced pressure. Add 20mL of ethyl acetate and 20mL of saturated sodium bicarbonate solution to the residue, stir, separate layers, extract 15mLX2 of the aqueous layer with ethyl acetate, combine the organic phases, dry, filter, concentrate, and purify by column chromatography to obtain the target compound (1), The yield is 55%.
Embodiment 2
[0028] (3R, 5aS, 6R, 8aS, 9R, 12S, 12aR)-octahydro-3-(carbahydrazino)methylene-6,9-dimethyl-3,12-oxo-12H-pyridine Fro[4,3-j]-1,2-benzodithiapine-10(3H)alcohol (2); the structure of compound (2) is shown below:
[0029]
[0030] Add 3.62 g (0.01 mol) of (3R, 5aS, 6R, 8aS, 9R, 12S, 12aR)-octahydro-3-bromomethylene-6,9-dimethyl-3,12 to the dry reactor -Oxo-12H-pyrano[4,3-j]-1,2-benzodithiapine-10(3H)alcohol and 22mLTHF, stirred, added 1.58g (0.02mol) of pyridine and 1.09g (0.012 mol) semicarbazide, reacted for 12 hours, and evaporated the solvent under reduced pressure. Add 20mL ethyl acetate and 20mL saturated sodium bicarbonate solution to the residue, stir, separate layers, extract 15mLX2 of the aqueous layer with ethyl acetate, combine the organic phases, dry, filter, concentrate, and purify by column chromatography to obtain 3-ureaaminodihydro Artemisinin, yield 52%.
Embodiment 3
[0032] (3R, 5aS, 6R, 8aS, 9R, 12S, 12aR)-octahydro-3-(methylcarbahydrazino)methylene-6,9-dimethyl-3,12-oxo-12H- Pyrano[4,3-j]-1,2-benzodithiapine-10(3H)ol (3);
[0033] The structure of compound (3) is shown below:
[0034]
[0035] Add 3.18 g (0.01 mol) of (3R, 5aS, 6R, 8aS, 9R, 12S, 12aR)-octahydro-3-chloromethylene-6,9-dimethyl-3,12 to the dry reactor -Oxo-12H-pyrano[4,3-j]-1,2-benzodithiapine-10(3H)alcohol and 20mL acetonitrile, stirred, added 1.58g (0.02mol) pyridine, 0.82 g (0.0005 mol) KI and 1.07g (0.012mol) methylcarbamohydrazide were reacted for 24 hours, and the solvent was distilled off under reduced pressure. Add 20mL ethyl acetate and 20mL saturated sodium bicarbonate solution to the residue, stir, separate layers, extract the aqueous layer with ethyl acetate 15mLX2, combine the organic phases, dry, filter, concentrate, and purify by column chromatography to obtain compound (3). The rate is 66%.
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