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Until the drugs enter humans life, they may face problems in transportation, drug delivery, and metabolism. These problems can cause reducing drug's therapeutic effect and even increase its side effects. Together, these cases can reduce the patient's compliance with the treatment and complicate the treatment process.

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[Synthesis and CNS-activity of spirocyclic pethidine and prodine analogs].

Arch Pharm (Weinheim)

September 1993

Institut für Pharmazie und Lebensmittelchemie, Universität München.

The bromoacetals 5a and 5b react with n-butyllithium and the piperidone 7 to yield the hydroxyacetals 8b and 8c, respectively. Cyclization of 8b and 8c followed by acid hydrolysis affords the spirocyclic hemiacetals 10b and 10c which are oxidized by PCC to give the spirocyclic prodine analogues 4b and 4c. The corresponding spirocyclic pethidine derivative 2 is prepared by alkylation of the 2-benzopyran-3-one 16 with N-Lost (17).

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The visual fixation of two groups of healthy newborn infants was tested at a mean age of three days. Mothers of the infants in one group received a single dose of meperidine (pethidine) during labour and delivery; those in the second group received no medication. Unlike infants of mothers who received a single dose of alphaprodine hydrochloride in a previous study, there were no differences between the groups in the present study.

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This study investigated the effects of pretreatment with muscimol (GABA-agonist) or diazepam (indirect GABAmimetic) on i.v. meperidine, fentanyl, alphaprodine and morphine, using rabbit tooth pulp and mouse hot plate assays.

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