Opiate receptor binding properties of morphine-, dihydromorphine-, and codeine 6-O-sulfate ester congeners
摘要:
A series of 3-O-acyl-6-O-sulfate esters of morphine, dihydromorphine, N-methylmorphinium iodide, codeine, and dihydrocodeine were prepared and evaluated for their ability to bind to mu-, delta-, kappa(1)-, kappa(2)-, and kappa(3)-opiate receptors. Several compounds exhibited good affinity for the p-opiate receptor. Morphine-3-O-propionyl-6-O-sulfate had four times greater affinity than morphine at the mu-opiate receptor and was the most selective compound at this receptor subtype. (c) 2006 Elsevier Ltd. All rights reserved.
Structure–activity relationships of some opiate glycosides
摘要:
A number of analogues of morphine-6-glucuronide 1 have been prepared and evaluated as potential analgesic agents by competitive mu-receptor binding assay and in vivo antinociceptive activity. The analogues show variation in the nature of the carbohydrate residue, the N-substituent, the O(3)-substituent and saturation of the 7,8-double bond compared to 1. In general, only the 6beta-glucoside or beta-glucuronide carbohydrate residues showed potent agonism; other modified carbohydrates were less active or exhibited potential antagonism. Variations in N-substituent led to either reduced agonism (N-H) or potential antagonism [N-allyl, N-(cyclopropyl)methyl]; a polar N-substituent, carboxymethyl, failed to bind. Saturation of the 7,8-double bond led to increased agonism compared to the parent compound in all three examples studied. (C) 2003 Elsevier Science Ltd. All rights reserved.
Preparation, X-ray structure and reactivity of a stable glycosyl iodide
作者:Jamie Bickley、Jennifer A. Cottrell、John R. Ferguson、Robert A. Field、John R. Harding、David L. Hughes、K. P. Ravindanathan Kartha、Jayne L. Law、Feodor Scheinmann、Andrew V. Stachulski
DOI:10.1039/b302629a
日期:——
Highly selective reaction of methyl tetra-O-pivaloyl-β-D-glucopyranuronate 2 with iodotrimethylsilane or (Me3Si)2 and I2 affords, in excellent yield, the ‘disarmed’ glycosyl iodide 1 which has good stability at 20 °C and excellent stability at 0 °C; the X-ray crystal structure of 1 is described, along with a comparison of its utility as a glycosyl donor to that of the corresponding bromide.
The invention provides a novel method for synthesising M6G, and intermediates therefor. In order to synthesise M6G the major problem to overcome is to obtain the glycoside linkage with very high &bgr;-selectivity since prior methods produce the &agr;-anomer. The invention provides a method for the preferential synthesis of the &bgr;-anomer of M6G which includes the step shown in Scheme 6 wherein use of DMAP is optional.
The invention provides a novel method for synthesizing Morphine-6-Glucuronide comprising the step of reacting 3-O-pivaloyloxymorphine and methyl 1&agr;,2-ethylorthopivalate-3-4,di-O-pivaloylglucouronate.
作者:Peter J. Meloncelli、Alan D. Martin、Todd L. Lowary
DOI:10.1016/j.carres.2009.02.032
日期:2009.6
The use of glycosyl iodides as an effective method for the preparation of glycosides has had a recent resurgence in carbohydrate chemistry, despite its early roots in which these species were believed to be of limited use. Renewed interest in these species as glycosylating agents has been spurred by their demonstrated utility in the stereoselective preparation of O-glycosides, and other glycosylic compounds. This review provides a brief historical account followed by an examination of the use of glycosyl iodides in the synthesis of oligosaccharicles and other glycomimetics, including C-glycosylic compounds, glycosyl azides and N-glycosides. (C) 2009 Elsevier Ltd. All rights reserved.