This invention provides a method for preparing
hydromorphone and dihydromorphine-like drugs via
polyethylene glycol modification and their applications, which have the
compound structure shown in general formula (I). The compounds provided by this invention reduce lipid
solubility through
polyethylene glycol modification, thereby slowing the rate of crossing the blood-brain barrier, slowing the release rate, prolonging the duration of action, and reducing the possibility of abuse. At
high doses, they exhibit
analgesic effects comparable to opioids, without producing side effects such as respiratory depression or
addiction, demonstrating good safety.