Enzymatic synthesis of a new inhibitor of α-amylases: acarviosinyl-isomaltosyl-spiro-thiohydantoin
摘要:
Synthesis of acarviosinyl-isomaltosyl-spiro-thiohydantoin in yields up to 20%, has been achieved by Bacillus stearothermophilus maltogenic amylase (BSMA). BSMA is capable of transferring the acarviosine-glucose residue from an acarbose donor onto glucopyranosylidene-spiro-thiohydantoin. Reactions were followed using HPLC and MALDI-TOF MS. (1H and 13C NMR studies revealed that the enzyme reserved its stereoselectivity. Glycosylation took place mainly at C-6 resulting in a-acarviosinyl-(14)-a-D-glucopyranosyl-(16)-D-glucopyranosylidene-spiro-thiohydantoin. This compound was found to be a much more efficient salivary amylase inhibitor than glucopyranosylidene-spiro-thiohydantoin with kinetic constants of K)(EI) (= 0.19 mM and K)(ESI) = 0.24 mM. 2005 Elsevier Ltd. All rights reserved.
Gram-scale synthesis of a glucopyranosylidene-spiro-thiohydantoin and its effect on hepatic glycogen metabolism studied in vitro and in vivo
作者:László Somsák、Veronika Nagy、Tibor Docsa、Béla Tóth、Pál Gergely
DOI:10.1016/s0957-4166(99)00486-3
日期:2000.2
A high yielding, simple synthesis is described starting from D-glucose to produce gram quantities of a glucopyranosylidene-spiro-thiohydantoin. This compound efficiently inhibited the activity of rat liver glycogen phosphorylase a; moreover, it also activated phosphorylase phosphatase which, in turn, decreased the amount of glycogen phosphorylase a. Both effects result in the inhibition of glycogen mobilization and the formation of glucose from glycogen. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of and a Comparative Study on the Inhibition of Muscle and Liver Glycogen Phosphorylases by Epimeric Pairs of <scp>d</scp>-Gluco- and <scp>d</scp>-Xylopyranosylidene-spiro-(thio)hydantoins and <i>N</i>-(<scp>d</scp>-Glucopyranosyl) Amides
D-Gluco- and D-xylopyranosylidene-spiro-hydantoins and -thiohydantoins were prepared from the parent sugars in a six-step, highly chemo-, regio-, and stereoselective procedure. In the key step of the syntheses C-(1-bromo-1-deoxy-beta -D-glycopyranosyl)formamides were reacted with cyanate ion to give spiro-hydantoins with a retained configuration at the anomeric center as the major products. On the other hand, thiocyanate ions gave spiro-thiohydantoins with an inverted anomeric carbon as the only products. On the basis of radical inhibition studies, a mechanistic rationale was proposed to explain this unique stereoselectivity and the formation of C-(1-hydroxy-beta -D-glycopyranosyl)formamides as byproducts. Enzyme assays with a and b forms of muscle and liver glycogen phosphorylases showed spiro-hydantoin 12 and spiro-thiohydantoin 14 to be the best and equipotent inhibitors with K-i values in the low micromolar range. The study of epimeric pairs of D-gluco and D-Xylo configurated spiro-hydantoins and N-(D-glucopyranosyl)amides corroborated the role of specific hydrogen bridges in binding the inhibitors to the enzyme.
Efficient inhibition of muscle and liver glycogen phosphorylases by a new glucopyranosylidene-spiro-thiohydantoin
作者:Erzsébet Ősz、László Somsák、László Szilágyi、László Kovács、Tibor Docsa、Béla Tóth、Pál Gergely
DOI:10.1016/s0960-894x(99)00192-4
日期:1999.5
Reaction of C-(1-bromo-1-deoxy-beta-D-glucopyranosyl)forma 2 with thiocyanate ions was the key step of a short synthesis of D-glucopyranosylidene-spiro-thiohydantoin 7 which proved to be a potent inhibitor of muscle and liver glycogen phosphorylases. (C) 1999 Elsevier Science Ltd. All rights reserved.
A new, scalable preparation of a glucopyranosylidene-spiro-thiohydantoin: one of the best inhibitors of glycogen phosphorylases
作者:László Somsák、Veronika Nagy
DOI:10.1016/s0957-4166(00)00107-5
日期:2000.5
per-O-benzoylated β-d-glucopyranosyl cyanide by mercury(II) cyanide in nitromethane. Partial hydrolysis of the nitrile with hydrogen bromide in acetic acid gave per-O-benzoylated C-(β-d-glucopyranosyl)formamide. Photobromination using bromine in carbon tetrachloride, chloroform, or dichloromethane gave the corresponding per-O-benzoylated 1-bromo-1-deoxy-β-d-glucopyranosyl cyanide and C-(1-bromo-1-deoxy-β-d-
Enzymatic synthesis of a new inhibitor of α-amylases: acarviosinyl-isomaltosyl-spiro-thiohydantoin
作者:Lili Kandra、Judit Remenyik、Gyula Batta、László Somsák、Gyöngyi Gyémánt、Kwan Hwa Park
DOI:10.1016/j.carres.2005.03.003
日期:2005.5
Synthesis of acarviosinyl-isomaltosyl-spiro-thiohydantoin in yields up to 20%, has been achieved by Bacillus stearothermophilus maltogenic amylase (BSMA). BSMA is capable of transferring the acarviosine-glucose residue from an acarbose donor onto glucopyranosylidene-spiro-thiohydantoin. Reactions were followed using HPLC and MALDI-TOF MS. (1H and 13C NMR studies revealed that the enzyme reserved its stereoselectivity. Glycosylation took place mainly at C-6 resulting in a-acarviosinyl-(14)-a-D-glucopyranosyl-(16)-D-glucopyranosylidene-spiro-thiohydantoin. This compound was found to be a much more efficient salivary amylase inhibitor than glucopyranosylidene-spiro-thiohydantoin with kinetic constants of K)(EI) (= 0.19 mM and K)(ESI) = 0.24 mM. 2005 Elsevier Ltd. All rights reserved.