Azetidine based transition state analogue inhibitors of N-ribosyl hydrolases and phosphorylases.
N-ribosyl phosphorylases and hydrolases catalyze nucleophilic displacement reactions by migration of the cationic ribooxacarbenium carbon from the fixed purine to phosphate and water nucleophiles, respectively. As the lysis reaction progresses along the reaction coordinate, the distance between the purine and carbocation increases and the distance between carbocation and nucleophile decreases. Immucillin-H and DADMe-immucillin-H have been shown previously to be potent inhibitors of purine nucleoside phosphorylases and lie more toward the reactant and products side of this reaction coordinate, respectively. Both these enzyme inhibitors, which are currently in human clinical trials for different indications, are chiral and expensive to manufacture. We now report the synthesis of azetidine analogues of the DADMe-immucillins, which, despite their lack of stereochemical complexity, remain potent inhibitors (equilibrium dissociation constants as low as 229 pM) of purine nucleoside phosphorylase (PNP), methylthioadenosine phosphorylase (MTAP), and methylthioadenosine nucleosidase (MTAN), with potential utility as drug candidates.
Evans
Gary B
GB
Carbohydrate Chemistry Team, Industrial Research Limited, PO Box 31310, Lower Hutt, New Zealand. g.evans@irl.cri.nz
Furneaux
Richard H
RH
Greatrex
Ben
B
Murkin
Andrew S
AS
Schramm
Vern L
VL
Tyler
Peter C
PC
D000818:Animals; D001384:Azetidines / Q000138:chemical synthesis* / Q000737:chemistry; D002417:Cattle; D006801:Humans; D010963:Plasmodium falciparum / Q000201:enzymology; D011683:Purine-Nucleoside Phosphorylase / Q000037:antagonists & inhibitors* / Q000737:chemistry; D011744:Pyrimidinones / Q000138:chemical synthesis* / Q000737:chemistry; D011759:Pyrrolidines / Q000138:chemical synthesis* / Q000737:chemistry; D013329:Structure-Activity Relationship
D001384:Azetidines; C508755:DADMe-immucillin H; D011744:Pyrimidinones; D011759:Pyrrolidines; D011683:Purine-Nucleoside Phosphorylase; C021784:5'-methylthioadenosine phosphorylase