The present invention includes compounds having structural formula (I), or pharmaceutically acceptable salts, solvates, and/or esters thereof. These compounds are useful for treating itch or a pruritic condition. The present invention also includes compositions comprising the present compounds and methods of treating a pruritic condition. Furthermore, the present invention provides methods for preparing the compounds.
[EN] PREPARATION OF OPIATE ANALGESICS BY REDUCTIVE ALKYLATION<br/>[FR] PREPARATIONS D'ANALGESIQUES OPIACES PAR ALKYLATION REDUCTRICE
申请人:JOHNSON MATTHEY PLC
公开号:WO2006035195A1
公开(公告)日:2006-04-06
A process for preparing a compound of formula (A), (B) or (C): wherein P is H, CH3 or a hydroxyl protecting group; X is O, a protected ketone, OH, a protected hydroxyl group or H; Y is OH, a protected hydroxyl group or H; W is C(CH3)2OH, C(CH3)(C(CH3)3)OH or COCH3; Z is C2-C10 alkyl or C2-C10 arylalkyl; and ′ is a. single bond or a double bond, is disclosed. The process is a reductive alkylation in the presence of hydrogen and a reductive alkylation catalyst.
The invention relates to a novel process for preparing N-methylnaltrexone bromide, comprising at least the steps consisting in:
(i) reacting N-methylnaltrexone methyl sulfate in aqueous solution with an alkaline agent chosen from the group constituted by sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, cesium carbonate, strontium carbonate and mixtures thereof, for a pH of the aqueous reaction medium of between 7 and 10, and then in
(ii) reacting the product thus obtained with hydrobromic acid, which is added for a pH of the aqueous reaction medium of between 0.5 and 5, in order thus to obtain the N-methylnaltrexone bromide.
The present invention relates to an improved process for producing naltrexone[17-(cyclopropylmethyl)-4,5α-epoxy-3,14-dihydroxy-morphinan-6-one] from noroxymorphone[4,5-α-epoxy-3,14-dihydroxy-morphinan-6-one] by alkylation with a cyclopropylmethyl halide.