Silver imidazolate

Silver imidazolate together with mercury(II) chloride or zinc(II) chloride has proved to an efficient promoting system for glycosidations. For example, l,2-(ra/w-linked aryl glucosides have been prepared from fully acetylated glycopyranosyl bromides in almost quantitative yield (equation 6).7(5... [Pg.786]

Silver(I) acetate, 396 Silver hexafluoroantimonate, 467 Silver imidazolate, 467 Silver nitrite-Mercury(II) chloride, 467-468 Silver(l) oxide, 468-469 Silver(II) oxide, 469 Silver perchlorate, 469-470 Silver tetrafluoroborate, 471 Silver(I) trifluoracetate, 471 Simmons-Smith reagent, 210-211, 472, 598 Sinularene, 246 Slaframine, 114, 115 Sodium amalgam, 473-475 Sodium-Ammonia, 472 Sodium benzeneselenoate, 475 Sodium bicarbonate, 476 Sodium bis(methoxyethoxy)aluminum hydride, 93, 476-477 Sodium borate, 322 Sodium borohydride, 477-479, 499 Sodium borohydride-Cobalt(IF) chloride, 479 Sodium borohydride-Methanesulfonic acid,... [Pg.338]

Glycosidation. The silver imidazolate-HgCl2 system favors formation of a-glucosides from reaction of 2,3,4,6-tetra-O-benzyl-a-D-glucopyranosyl chlorides and -a-D-gallactopyranosyl chlorides with sterically hindered alcohols. Addition of tetra-u-bulylammonium chloride (1.4 equiv.) enhances the rate.1... [Pg.576]

Garegg, P J, Johansson, R, Samuelsson, B, Silver imidazolate-assisted glycosidations. Part 6. Synthesis of 1,2-rranj-linked disaccharides, Acta Chem. Scand. B, 36, 249-250, 1982. [Pg.172]

GLYCOSIDES Bromotrimethylsilane-Cobalt(II) bromide. Iodonium di-sym-collidine perchlorate. Mercury(II) nitrate. Silver imidazolate. Stannous chloride-Silver perchlorate. [Pg.241]

Sharpless oxidation, 8 Sila-Pummerer rearrangement, 314 Silica, 18, 185, 342, 346-347 Silicon(IV) chloride, 347 Silver carbonate, 350 Silver chloride, 347-348 Silvcr(II) dipicolinate, 348 Silver fluoride-Pyridine, 348 Silver imidazolate, 349-350 Silver(I) nitrate, 350 Silver(l) oxide, 350-351 Silver(II) oxide, 80, 352-354 Silver perchlorate, 354-355 Silver(I) trifluoracetate, 365 Silybin, 351,352 2-Silyl-l,3-dithianes, 380 Silyl nitronates, 381 SMEAH, 357... [Pg.266]

The use of silver imidazolate and zinc chloride[(or mercury(II) chloride] together with iodine, and then adding the alcohol in a one-pot procedure, which affords the 2-deoxy-2-iodoglucosides.80... [Pg.90]

Indirect routes232 can be employed to synthesize JV,JV-bis(TMS)-carbodiimide (458) (a) by applying silver imidazole to 7V,jV-bis(TMS)-thiourea (457) (equation 213), (b) by reaction of Me3SiCl with silver cyanamide (459) (equation 214), (c) by reaction of Me3SiCl with hydrogen cyanamide (460) in the presence of a tertiary amine (equation 215) and (d) from cyanogen bromide (461) and hexamethyldisilazane (405) (equation 216). [Pg.712]

Other first generation insoluble promoters that include silver tosylate [26], silver salicylate [27], silver imidazolate [28] and silver carbonate [29] have proved... [Pg.242]

Methods of synthesis of a-linked D-glucose disaccharides continue to attract attention and tetra-O -benzyl-a-D-glucopyranosyl chloride used in the presence of silver imidazolate and mercury(II) chloride gave, with l,2 3, -di-0-isopropylidene-a-D-galactose and 1,2 5,6-di-O-isopropylldene-a-D-glucofuranose, products containing more than 50% of the a-llnked disaccharides. Considerably... [Pg.26]

In the area of D-mannopyranosyl disaccharides, 2,3 4,6-di-O-cyclohexylidene-a-D-mannopyranosyl chloride in the presence of silver imidazolate and mercury(II) chloride leads to moderate yields ... [Pg.27]

Garegg s silver zeolite [87] is also a powerful promoter [82, 88-90] and has been reported to afford increased yields and P-selectivity over silver silicate [82, 91]. Other activators, including silver imidazolate [92], silver salicylate [93], and thallium zeolite [88] have also been investigated. [Pg.322]

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