190662-30-7Relevant articles and documents
Preparation method of dienogest
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Paragraph 0079-0082, (2021/01/24)
The invention relates to a preparation method of dienogest. The preparation method comprises the following steps: providing a compound with a structure shown as a formula (II); and carrying out an acidolysis deprotection reaction on the compound shown in the formula (II) in an aqueous fluoboric acid solution to prepare a compound with a structure shown in a formula (I). According to the preparation method of the dienogest, the problems of low purity and dark color of a crude product of an acidolysis deprotection process are fundamentally solved, a production process is greatly simplified, andthe production cost of an enterprise is reduced.
Method for the preparation of steroid derivative ketal
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, (2008/06/13)
The invention relates to a method for the preparation of a compound of formula II: STR1 wherein a compound of formula V: STR2 is condensed with a compound of the formula CH3 -C(OR4 O)-(CH2)3 -XHal and R1, R2, R3, R4, X and Hal are as defined by the specification.