3-N-Acetylglucosaminides of unconjugated, glycine- and taurine-conjugated bile acids have been synthesized. Bile acids appropriately protected were condensed with acetochloroglucosamine through the 3 alpha-hydroxyl group by means of the Koenigs-Knorr reaction using cadmium carbonate as a catalyst. Subsequent borohydride reduction and/or
A series of the protected alkyl glycosides 5a/5b-12a/12b was synthesized from the parent isomeric alcohols (insect juvenile hormone bioanalogs; juvenoids), 4-[4'-(2''-hydroxycyclohexyl)methylphenoxy]-3-methyl-but-2-enoic acid ethyl ester (1a/1b-4a/4b; racemic structures) and (1a-4a; enantiopure structures). Cadmium carbonate was used as a promoter of this
In the high-responder A/J mice a lower percentage of peritoneal macrophages express Fc receptors and accordingly phagocytize less intensely via these receptors than the macrophages of the low-IgG-responder C57BL/10ScSn strain. Similarly, the phagocytosis mediated by the receptors for foreign substances
The synthesis of 15-N-acetylglucosaminides of 15 alpha-hydroxyesterone, 15 alpha-hydroxyestradiol, and 15 alpha-hydroxyestriol (estetrol) is described. The latter two were prepared by condensation of 2-acetamido-1 alpha-chloro-1,2-dideoxy-3,4,6-trio-O-acetyl-D-glucopyranose with appropriately protected 15 alpha-hydroxyestrogens by the Koenigs-Knorr reaction employing cadmium carbonate as a catalyst.
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![Poly[(R)-3-hydroxybutyric acid] natural origin](/deepweb/assets/sigmaaldrich/product/structures/129/476/7d1c924b-f644-4889-a2d6-d7a923ce382c/640/7d1c924b-f644-4889-a2d6-d7a923ce382c.png)
