1-Chloro-2-deoxy-3,5-di-O-benzoyl-a-D-ribofuranose - CAS 503625-15-8
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CAS 503625-15-8 1-Chloro-2-deoxy-3,5-di-O-benzoyl-a-D-ribofuranose

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1.Convenient syntheses of 5-O- and 3,5-di-O-(beta-D-galactofuranosyl)-D-galactofuranose.
de Lederkremer RM1, Marino C, Varela O. Carbohydr Res. 1990 Apr 25;200:227-35.
Benzoylation of D-galactono-1,4-lactone with 2.2 mol of benzoyl chloride, at -23 degrees, gave the 2,6-dibenzoate (2, 62%). Tin(IV) chloride-catalyzed glycosylation of 2 with 1,2,3,5,6-penta-O-benzoyl-alpha,beta-D-galactofuranose (1) afforded 2,6-di-O-benzoyl-5-O-(2,3,5,6-tetra-O-benzoyl-beta-D-galactofuranosyl)-D - galactono-1,4-lactone (4, 70%), HO-3 of which was benzoylated to give 5. The structure of 4 was confirmed by its conversion into crystalline beta-D-Galf-(1----5)-D-Gal-ol (8). Reduction of the lactone function of 5 with di-isoamylborane followed by debenzoylation gave beta-D-Galf-(1----5)-D-Galf (7). A by-product of the condensation of 1 with 2 was characterized as 2,6-di-O-benzoyl-3,5-di-O-(2,3,5,6-tetra-O-benzoyl-beta-D-galactofuranos yl)-D- galactono-1,4-lactone (9), which was converted, as for 5, into beta-D-Galf-(1----3)[beta-D-Galf-(1----5)]-D-Galf (13).
2.Stereospecific 1,4-addition to an alpha,beta-unsaturated steroidal epoxide: syntheses of new 15-oxygenated sterols.
Parish EJ1, Tsuda M, Schroepfer GJ Jr. Chem Phys Lipids. 1988 Nov;49(1-2):119-29.
3 beta-Benzoyloxy-14 alpha,15 alpha-epoxy-5 alpha-cholest-7-ene (1) is a key intermediate in the synthesis of C-7 and C-15 oxygenated sterols. Treatment of 1 with benzoyl chloride resulted in the formation of 3 beta,15 alpha-bis-benzoyloxy-7 alpha-chloro-5 alpha-cholest-8(14)-ene (2). Reaction of 2 with LiAlH4 or LiAlD4 resulted in the formation of 5 alpha-cholest-7-ene-3 beta,15 alpha-diol (3a) or [14 alpha-2H]5 alpha-cholest-7-ene-3 beta,15 alpha-diol (3b). Diol 3b was selectively oxidized by Ag2CO3/celite to [14 alpha-2H]5 alpha-cholest-7-en-15 alpha-ol-3-one (4). Treatment of 1 with MeMgI/CuI gave 7 alpha-methyl-5 alpha-cholest-8(14)-ene-3 beta,15 alpha-diol (5). Selective oxidation of 5 with pyridinium chlorochromate (PCC)/pyridine or oxidation with PCC resulted in the formation of 7 alpha-methyl-5 alpha-cholest-8(14)-en-3 beta-ol-15-one (6) and 7 alpha-methyl-5 alpha-cholest-8(14)-ene-3,15-dione, respectively. Reduction of 6 with LiAlH4 yielded 5 and 7 alpha-methyl-5 alpha-cholest-8(14)-ene-3 beta,15 beta-diol (6).
3.Convenient synthesis of 4,6-di-O-benzyl-myo-inositol and myo-inositol 1,3,5-orthoesters.
Praveen T1, Shashidhar MS. Carbohydr Res. 2001 Feb 15;330(3):409-11.
Convenient high yielding methods for the preparation of 4,6-di-O-benzyl-myo-inositol, myo-inositol 1,3,5-orthoformate and myo-inositol 1,3,5-orthoacetate, without involving chromatography are described. Myo-inositol was converted to racemic 2,4-di-O-benzoyl-myo-inositol 1,3,5-orthoformate by successive treatment with triethyl orthoformate and benzoyl chloride. The dibenzoate obtained on benzylation with benzyl bromide and silver(I) oxide gave 2-O-benzoyl-4,6-di-O-benzyl-myo-inositol 1,3,5-orthoformate. Deprotection of the benzoate and the orthoformate with isobutylamine and aqueous trifluoroacetic acid, respectively gave 4,6-di-O-benzyl-myo-inositol in an overall yield of 67%. Myo-inositol orthoformate and orthoacetate were prepared and isolated as their tribenzoates. The free orthoesters were regenerated by deprotection of the benzoates by aminolysis with isobutylamine.
4.High-performance liquid chromatographic determination of PEG 600 in human urine.
Kinahan IM1, Smyth MR. J Chromatogr. 1991 Apr 19;565(1-2):297-307.
Polyethylene glycols (PEGs) are non-ionic, water-soluble synthetic polymers which have been widely used for many applications. Since they are of very low toxicity and are readily excreted in urine, PEGs in the molecular weight range 400-6000 have been used extensively in the study of intestinal physiology in man. A high-performance liquid chromatographic (HPLC) method has been developed for the determination of PEG 600 in human urine, which includes a pre-column derivatisation step. The dibenzoate derivatives of PEG 600 can be quantitatively prepared, and this, coupled with ultraviolet detection at 230 nm, has greatly improved the limit of detection for the determination of PEGs by HPLC. A suitable extraction procedure has also been developed which enabled PEG levels in urine to be monitored with much greater sensitivity than any previously reported method.