Toward partial fucosyl transferase transition state analogues: methylene sulfono sulfonamide as surrogate of pyrophosphate
摘要:
Partial fucosyl transferase transition state analogues having sulfonoacetamido- and methylene sulfono sulfonamide links as a non-charged surrogate of the pyrophosphate moiety have been prepared from fructose and guanosine. The use of a MOM group at N1 and a formamidine group at the primary amine function for the protection of the guanine residue proved troublesome. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis and membranoprotective properties of new disulfides with monoterpene and carbohydrate fragments
作者:S. V. Pestova、E. S. Izmest´ev、O. G. Shevchenko、S. A. Rubtsova、A. V. Kuchin
DOI:10.1007/s11172-015-0926-2
日期:2015.3
A cooxidation of carbohydrate and terpene thiols gives mixtures of disulfides containing 51—90% of the unsymmetric product. Membranoprotective and antioxidant properties of obtained unsymmetric and symmetric disulfides were evaluated based on their ability to inhibit the H2O2-induced hemolysis of erythrocytes, as well as the accumulation of secondary products of the peroxy oxidation of lipids and the
Sterically Strained Brønsted Pair Catalysis by Bulky Pyridinium Salts: Direct Stereoselective Synthesis of 2-Deoxy and 2,6-Dideoxy-β-thioglycosides from Glycals
作者:Ananya Mukherji、Rupa Bai Addanki、Suvendu Halder、Pavan K. Kancharla
DOI:10.1021/acs.joc.1c02305
日期:2021.12.3
activation of a third molecule like thiol via hydrogen-bonding. This intriguing weak interaction-based reactivity has been utilized to develop an organocatalytic synthesis of 2-deoxy-β-thioglycosides from glycals. While the 1H NMRstudies showcase the diamagnetic activation of thiols in the presence of the catalyst, the electron paramagnetic resonance (EPR) studies reveal the generation of a radical
Synthesis and membrane protective activity of bis-sulfides derived from monoterpenoids and monosaccharides
作者:S. V. Pestova、E. S. Izmest’ev、O. G. Shevchenko、S. A. Rubtsova、A. V. Kuchin
DOI:10.1134/s1068162017030141
日期:2017.5
Hydroxyl- and chloroethyl derivatives of neomenthane- and isobornanethiol in yields of to 80% were synthesized. They served as the basis for the preparation of new bis-sulfides with diacetone-protected galacto- and fructopyranose fragments in yields up to 98%. The bis-sulfides synthesized were screened for membrane protective and antioxidant properties in a model cell system (in vitro) based on their ability to inhibit the H2O2-induced hemolysis of erythrocytes and retard the oxyhemoglobin oxidation.
Toward partial fucosyl transferase transition state analogues: methylene sulfono sulfonamide as surrogate of pyrophosphate
Partial fucosyl transferase transition state analogues having sulfonoacetamido- and methylene sulfono sulfonamide links as a non-charged surrogate of the pyrophosphate moiety have been prepared from fructose and guanosine. The use of a MOM group at N1 and a formamidine group at the primary amine function for the protection of the guanine residue proved troublesome. (C) 2003 Elsevier Ltd. All rights reserved.
Glycosyl <i>o</i>-[1-(<i>p</i>-MeO-Phenyl)vinyl]benzoates (PMPVB) as Easily Accessible, Stable, and Reactive Glycosyl Donors for O-, S-, and C-Glycosylations under Brønsted Acid Catalysis
作者:Suvendu Halder、Rupa Bai Addanki、Sangay Moktan、Pavan K. Kancharla
DOI:10.1021/acs.joc.2c00093
日期:2022.6.3
alkene-based glycosyldonors that can be activated with catalytic amounts of a Brønsted acid. This activation protocol not only allows us to synthesize O-glycosides but also can successfully provide S- and C-linked glycosides. The armed and disarmed donors lead to product formation in 5 min, showcasing the high reactivity of the donors. Competitive experiments show that the PMPVB donors are much more