| 摘要 |
The present invention is to provide a process for producing a 2'-O-acetyl-4''-O-formyl-8,9-anhydroerythromycin A 6,9-hemiketal compound 4, and it provide a process for producing an erythromycin compound which comprises reacting a formylating agent with a 2'-O-acetylerythromycin A compound 2 to obtain 2'-O-acetyl-4''-O-formylerythromycin A compound 3, then, acting an acid on Compound 3 to subject to hemiketalation, and then adding an aqueous basic solution in an aqueous solution to precipitate Compound 4 as free crystals.
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