3 research outputs found
Rapid Assembly of a Library of Lipophilic Iminosugars via the Thiol–Ene Reaction Yields Promising Pharmacological Chaperones for the Treatment of Gaucher Disease
A highly divergent route to lipophilic iminosugars that
utilizes the thiol–ene reaction was developed to enable the
rapid synthesis of a collection of 16 dideoxyiminoxylitols bearing
various different lipophilic substituents. Enzyme kinetic analyses
revealed that a number of these products are potent, low-nanomolar
inhibitors of human glucocerebrosidase that stabilize the enzyme to
thermal denaturation by up to 20 K. Cell based assays conducted on
Gaucher disease patient derived fibroblasts demonstrated that administration
of the compounds can increase lysosomal glucocerebrosidase activity
levels by therapeutically relevant amounts, as much as 3.2-fold in
cells homozygous for the p.N370S mutation and 1.4-fold in cells homozygous
for the p.L444P mutation. Several compounds elicited this increase
in enzyme activity over a relatively wide dosage range. The data assembled
here illustrate how the lipophilic moiety common to many glucocerebrosidase
inhibitors might be used to optimize a lead compound’s ability
to chaperone the protein in cellulo. The flexibility of this synthetic strategy makes it an attractive
approach to the rapid optimization of glycosidase inhibitor potency
and pharmacokinetic behavior
Rapid Assembly of a Library of Lipophilic Iminosugars via the Thiol–Ene Reaction Yields Promising Pharmacological Chaperones for the Treatment of Gaucher Disease
A highly divergent route to lipophilic iminosugars that
utilizes the thiol–ene reaction was developed to enable the
rapid synthesis of a collection of 16 dideoxyiminoxylitols bearing
various different lipophilic substituents. Enzyme kinetic analyses
revealed that a number of these products are potent, low-nanomolar
inhibitors of human glucocerebrosidase that stabilize the enzyme to
thermal denaturation by up to 20 K. Cell based assays conducted on
Gaucher disease patient derived fibroblasts demonstrated that administration
of the compounds can increase lysosomal glucocerebrosidase activity
levels by therapeutically relevant amounts, as much as 3.2-fold in
cells homozygous for the p.N370S mutation and 1.4-fold in cells homozygous
for the p.L444P mutation. Several compounds elicited this increase
in enzyme activity over a relatively wide dosage range. The data assembled
here illustrate how the lipophilic moiety common to many glucocerebrosidase
inhibitors might be used to optimize a lead compound’s ability
to chaperone the protein in cellulo. The flexibility of this synthetic strategy makes it an attractive
approach to the rapid optimization of glycosidase inhibitor potency
and pharmacokinetic behavior
Synthesis of 1,5-Dideoxy-1,5-iminoribitol <i>C</i>‑Glycosides through a Nitrone–Olefin Cycloaddition Domino Strategy: Identification of Pharmacological Chaperones of Mutant Human Lysosomal β‑Galactosidase
We report herein
a newly developed domino reaction that facilitates
the synthesis of new 1,5-dideoxy-1,5-iminoribitol iminosugar <i>C</i>-glycosides <b>7a</b>–<b>e</b> and <b>8</b>. The key intermediate in this approach is a six-membered
cyclic sugar nitrone that is generated in situ and trapped by an alkene
dipolarophile via a [2 + 3] cycloaddition reaction to give the corresponding
isooxazolidines <b>10a</b>–<b>e</b> in a “one-pot”
protocol. The iminoribitol <i>C</i>-glycosides <b>7a</b>–<b>e</b> and <b>8</b> were found to be modest
β-galactosidase (bGal) inhibitors. However, compounds <b>7c</b> and <b>7e</b> showed “pharmacological chaperone”
activity for mutant lysosomal bGal activity and facilitated its recovery
in GM1 gangliosidosis patient fibroblasts by 2–6-fold