2136287-65-3Relevant articles and documents
Preparation method of sulfur-containing hetero-seven-membered ring compound
-
Paragraph 0043-0044; 0050-0054, (2021/06/13)
The invention relates to a preparation method of a sulfur-containing hetero-seven-membered ring compound. The method comprises the following steps: carrying out halogenation reaction, nucleophilic substitution, acylation, cyclization, reduction and the li
Method for preparing baloxavir intermediate and intermediate obtained by method
-
, (2020/12/30)
The invention belongs to the technical field of chemical synthesis, and provides a method for preparing a balosavir intermediate. The method comprises the following steps: (1) methylating 3,4-difluorobromobenzene to obtain a compound A-1; (2) reacting the compound A-1 with a Grignard reagent, then introducing carbon dioxide gas for reaction, and adding acid for acidification to obtain a compound A-2; (3) brominating the compound A-2 to obtain a compound A-3; (4) adding diphenyl disulfide and a reducing agent 1 into THF, dropwise adding methanol, dropwise adding the compound A-3, and reacting to obtain a compound A-4; (5) carrying out ring closing reaction on the compound A-4 in polyphosphoric acid to obtain a compound A-5; and (6) reducing the compound A-5 into alcohol by adopting a reducing agent 2 to obtain a compound A-6. According to the method, highly toxic and foul thiophenol is prevented from being used while expensive reagents are prevented from being used, so that the processcost is reduced. The invention also provides an intermediate compound prepared by the method.
Preparation method of baloxavir intermediate
-
Paragraph 0101-0106, (2020/03/17)
The invention relates to a preparation method of a baloxavir intermediate and belongs to the field of medicinal chemistry. With the compound (A) as an initial raw material, the method includes a halogenation reaction, a Grignard reaction, a halogenation r