Pregna-4,9(11),16-triene-3,20-dione synthesis
- Product Name:Pregna-4,9(11),16-triene-3,20-dione
- CAS Number:21590-20-5
- Molecular formula:C21H26O2
- Molecular Weight:310.43
116256-54-3
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21590-20-5
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Yield:21590-20-5 92%
Reaction Conditions:
with sulfuric acid;acetic acid in water at 5 - 35; for 6 h;Temperature;
Steps:
1.2
In the second step, eliminate the reaction by adding water (42ml, 3V), concentrated sulfuric acid (84ml, 6V) and glacial acetic acid (14ml, 1V) to a 250ml reaction flask, cooling to 5°C, and adding Compound 2 (14g, 1W). The reaction temperature was kept at 35°C for 6 hours, the temperature was lowered, the reaction solution was poured into drinking water (420ml, 30V), and the mixture was filtered and dried under reduced pressure at 60°C to obtain compound 3 (12.88g). The weight yield was 92%. HPLC Content 96.8%;
References:
CN107698644,2018,A Location in patent:Page/Page column 7
34184-82-2
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63973-95-5
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1882-82-2
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21590-20-5
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$1225.00/25mg