Mannopyranoside phenyl

Ph glycoside, tri-Ac Phenyl 2,3,4-tri-O-acetyl-6-deoxy-a-L-mannopyranoside. Phenyl 2,3,4-tri-O-acetyl-a-L-rhamno-pyranoside C18H22O8 366.367 Mp 130-131°. Mi, -80 (CHCI3). 

Methylumbelliferyl p-D-xylopyranoside ort/w-A itrophenyl P-D-galactopyranoside ortAn-A itrophenyl P-D-glucopyranoside para-Chlorophenyl P-D-mannopyranoside Phenyl P-D-galactopyranoside Phenyl P-D-glucopyranoside... 

IC with bovine enzyme which is very similar to the human one. Inhibitor concentration for 50% inhibition. K of substrate (phenyl a-D-mannopyranoside). K of substrate (4-nitrophenyl a-D-manno-pyranoside). K of substrate (4-nitrophenyl D-glucosiduronic acid). K of substrate (4-nitrophenyl 2-acetamido-2-deoxy- o-glueoside). Inhibitors were chitotetraono-1,5-lactone and chitotetraose, respectively. 

The electron-withdrawing capability of the disarming substituent at the 6-position also controls the stereochemical outcome of the Crich glycosylation method. Thus, 6-mono- and difluoro substituted 5-phenyl 2,3,4-tri-0-benzyl-D-mannopyranosides 27 and 28 and the trifluoro analogue of 5-phenyl... 

C26H26N404 Methyl 4,6-0-benzylidene-2,3-dideoxy-2,3-di(phenyl-azo)-a-D-mannopyranoside (MBYZMN)118... 

The interaction of excess concanavalin A (P) with the chromogenic disaccharide p-nitro-phenyl-2-0-a-Z>-mannopyranosyl-a-Z)-mannopyranoside(M) 10(a) displays a spectral-time course shown in Fig. 1.9." It is clearly biphasic and... 

Scheme 15.2 Covalent imprinting of a-phenyl-D-mannopyranoside in a divinyl benzene/4-vinylphenylboronic acid matrix, via the formation of covalent boionic ester linkages between the 4-vinylphenylboronic acid and the carbohydrate. Adapted from Wulff, Vesper, et al. (1977). Copyright 1977 Wiley InterScience.

D-Mannono-1,5-lactone68 gave a value of 0.07 mM for Kj with rat-epididymal a-D-mannosidase, compared with 12 mM for Km for p-nitrophenyl a-D-mannopyranoside,88 and 57 mM for phenyl a-D-mannopyranoside.65 With jack-bean a-D-mannosidase, the values... 

Watters, Hockett and Hudson1 have prepared a non-crystalline monomethylmannose which forms an osazone with the same properties as those of 6-methyl-n-glucosazone. The synthesis was achieved by methylation of methyl 2,3,4-triacetyl-a-D-mannopyranoside, followed by hydrolysis. Schmidt and Heiss,13 studying the epimerization of 6-methyl-D-gluconic acid, have claimed to have isolated the phenyl-hydrazide of 6-methyl-n-mannonic acid. 

Since phenyl a-D-galactopyranoside did react, although slowly, it is apparent that this substance was converted to some intermediate common to it and the jS-D-galactopyranoside, or else it was degraded by a mechanism unique to itself. The conversion of phenyl /3-D-mannopyranoside to l,6-anhydro-/3-D-mannopyranose9 was effected with relative ease, whereas phenyl a-D-mannopyranoside reacted at about the same rate but the intermediate product, which was apparently not stabilized by 1,6-anhydride formation, underwent extensive destruction in the alkali.8... 

The operation of the double-inversion mechanism requires that the hydroxyl group on C2 be Irans to the glycosidic phenoxy group on Cl.17 Obviously this condition is not fulfilled in phenyl /3-D-mannopyranoside. 

The degradation of phenyl a-D-mannopyranoside (XXXII) leads to the formation of tars. This compound possesses the requisite trans relation between the reactive groups on Cl and C2, although the theoretical intermediate, l,2-anhydro-/3-D-mannopyranose (XXXIII), would not be able... 

A second mechanism for rationalizing the inconsistencies observed has been formulated as an ionic dissociation, and is here applied to the degradation of phenyl /3-D-mannopyranoside (XLIII). By this mechanism, the... 

Figure 7. Normalized difference spectra for con A-Mt and con A-p-nitro-phenyl a-v-mannopyranoside complexes. The relative absorbance is defined as the ratio of the absorbance difference at a given wavelength to the absolute value of the absorbance difference at 317 nm. Spectra were obtained by mixing 200 /iM intact con A and 40 ligand (O) con A-M, (A) con A-p-nitrophentjl a-D-mannopyranoside.

The template monomer was designed for imprinting by inclusion in the microgels formed, followed by hydrolysis during suspension in methanol/water (1 1, v/v). Thus, the boronic ester was split and phenyl-a-D-mannopyranoside 2 (Fig. 2) was removed, leaving free binding sites in the polymer network. 

Molecular recognition experiments were carried out with a racemic mixture of phenyl-a-mannopyranoside 2 (Fig. 2) in a heterogeneous phase as well as in a homogeneous phase depending on the solubility of the microgel in the... 

Fig. 2. Phenyl-2,3 4,6-tetra-0-bis(4-vinylphenylboronyl)-a-D-mannopyranoside 1, phenyl-a-D-mannopyranoside 2, EGDMA 3, TRIM 4, and 2,5-di-0-methacryloyl-l,4 3,6-dianhydro-D-sorbitol 5...

Efficient syntheses of trehazolamine (5) starting from D-mannose (Scheme 15)79 have been readily achieved by deacetylation of phenyl 1-thio-a-D-mannopyranoside (109),80 followed by monoacetonation under kinetic conditions to give 110. Regio-selective benzylation of the equatorial hydroxyl group of 110 gave 111, whose... 

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