Stereoselective Aldol Additions Catalyzed by Dihydroxyacetone Phosphate-Dependent Aldolases in Emulsion Systems: Preparation and Structural Characterization of Linear and Cyclic Iminopolyols from Aminoaldehydes
hydroxyl group originating from the aldehyde. Characterization of the resulting iminocyclitols allowed the assessment of the diastereoselectivity of the enzymatic aldol reactions with respect to the N-protected aminoaldehyde. RAMA formed single diastereoisomers from N-Cbz-glycinal and from both enantiomers of N-Cbz-alaninal, while 14 % of the epimeric product was observed from N-Cbz-3-aminopropanal. Diastereoselectivity
Fructose-6-phosphate Aldolase in Organic Synthesis: Preparation of <scp>d</scp>-Fagomine, <i>N</i>-Alkylated Derivatives, and Preliminary Biological Assays
作者:José A. Castillo、Jordi Calveras、Josefina Casas、Montserrat Mitjans、M. Pilar Vinardell、Teodor Parella、Tomoyuki Inoue、Georg A. Sprenger、Jesús Joglar、Pere Clapés
DOI:10.1021/ol0625482
日期:2006.12.1
straightforward two-step chemo-enzymatic synthesis of D-fagomine and some of its N-alkylated derivatives in 51% isolated yield and 99% de. The key step is the FSA-catalyzed aldol addition of simpledihydroxyacetone (DHA) to N-Cbz-3-aminopropanal. The use of FSA greatly simplifies the enzymatic procedures that used dihydroxyacetonephosphate or DHA/esters. Some N-alkyl derivatives synthesized elicited antifungal
Assessment of Partially Deoxygenated Deoxynojirimycin Derivatives as Glucosylceramide Synthase Inhibitors
作者:Richard J. B. H. N. van den Berg、Tom Wennekes、Amar Ghisaidoobe、Wilma E. Donker-Koopman、Anneke Strijland、Rolf G. Boot、Gijsbert A. van der Marel、Johannes M. F. G. Aerts、Herman S. Overkleeft
DOI:10.1021/ml200050s
日期:2011.7.14
N-butyldeoxynojirimycin (Zavesca) is thought to inhibit through mimicry of its substrate, ceramide. In this work we demonstrate that, in contrast to what is proposed in this model, the C2-hydroxyl of the deoxynojirimycin core is important for GCS inhibition. Here we show that C6-OH appears of less important, which may set guidelines for the development of GCS inhibitors that have less affinity (in comparison with
Organocatalyzed synthesis of (−)-4-epi-fagomine and the corresponding pipecolic acids
作者:Jasna Marjanovic、Zorana Ferjancic、Radomir N. Saicic
DOI:10.1016/j.tet.2015.07.036
日期:2015.9
The enantioselective synthesis of 4-epi-fagomine was accomplished starting from dioxanone and Cbz-protected benyzlamine, in 4 steps, with 18% overall yield. The key feature of this synthetic approach is the tactical combination of reactions: organocatalyzed aldolization/reductive amination, which allows for a quick formation of heterocyclic rings with defined absolute configuration of all stereogenic centers. Two hydroxypipecolic acids and a reduced fagomine analogue were also synthesized. (C) 2015 Elsevier Ltd. All rights reserved.
Docking and SAR studies of d- and l-isofagomine isomers as human β-glucocerebrosidase inhibitors
We report the structure-activity relationship of a series of D-, and L-isofagomine and fagomine isomers as glycosidase inhibitors. Our study revealed that a positive charge at the anomeric position of D-isofagomines enhanced the potency toward beta-glycosidases, while the epimerization at the C3 OH group drastically reduced their inhibitory potency by over three orders of magnitude. Furthermore, D-3,4-di-epi-isofagomine abolished their inhibition activities against all enzymes. L-Isofagomine was also a fairly potent inhibitor of human beta-glucocerebrosidase, with an IC50 value of 8.7 mu M. A molecular docking study revealed that the positions and orientations of the piperidine ring of D-3-epi-isofagomine in the binding site was similar to that of D-isofagomine, while D-3-epi-isofagomine missed the hydrogen bond interactions between Asp127 and the 3-OH group and between Trp179 and the 3-OH group. Furthermore, the top 10 docking models ranked by IFDscore suggested that D-3,4-di-epi-isofagomine can not bind to beta-glucocerebrosidase at a stable interaction mode. These results provide an insight into the structural requirements of isofagomine isomers for developing a new type of pharmacological chaperone for Gaucher disease. (C) 2011 Elsevier Ltd. All rights reserved.