title: Synthesis of both enantiomers of hydroxypipecolic acid derivatives equivalent to 5-azapyranuronic acids and evaluation of their inhibitory activities against glycosidases.
abstract: We have synthesized 3-hydroxy- and 3,4,5-trihydroxypipecolic acid derivatives corresponding to 5-aza derivatives of uronic acids and evaluated their inhibitory activities against various glycosidases including beta-glucuronidase. Compounds 4 and 5 were chosen as common intermediates for the synthesis of 3,4,5-trihydroxypipecolic acids and 3-hydroxypipecolic acids as well as for 3-hydroxybaikiain, a unique natural product isolated from a toxic mushroom. Cross aldol reaction of N-Boc-allylglycine derivative with acrolein followed by the ring-closing metathesis gave 4 and 5 as a mixture of diastereomers which could be separated by silica gel column chromatography. By employing lipase-catalyzed kinetic resolution, the synthesis of both L- and D-isomers of 3,4,5-trihydroxy- and 3-hydroxypipecolic acids was achieved. None of the compounds tested showed inhibitory activity against alpha- and beta-glucosidases. On the other hand, L-23 and L-29 were found to have potent inhibitory activity against beta-glucuronidase. In addition, it is interesting that some uronic-type azasugar derivatives showed moderate inhibitory activities against beta-N-acetylglucosaminidase.
authors.affiliation: Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University, 4-4-1, Komatsushima, Aoba-ku, Miyagi, Sendai 981-8558, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Yoshimura
authors.forename: Chiaki
authors.initials: C
authors.lastname: Ohara
authors.forename: Tatsushi
authors.initials: T
authors.lastname: Imahori
authors.forename: Yukako
authors.initials: Y
authors.lastname: Saito
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kato
authors.forename: Saori
authors.initials: S
authors.lastname: Miyauchi
authors.forename: Isao
authors.initials: I
authors.lastname: Adachi
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takahata
mesh_terms: D000818:Animals; D001372:Aza Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D002417:Cattle; D002645:Chickens; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D006026:Glycoside Hydrolases / Q000037:antagonists & inhibitors*; D006801:Humans; D015394:Molecular Structure; D010875:Pipecolic Acids / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013696:Temperature; D013997:Time Factors; D014574:Uronic Acids / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D001372:Aza Compounds; D004791:Enzyme Inhibitors; D010875:Pipecolic Acids; D014574:Uronic Acids; D006026:Glycoside Hydrolases