Isolation, structure identification and SAR studies on thiosugar sulfonium salts, neosalaprinol and neoponkoranol, as potent α-glucosidase inhibitors
摘要:
Two hitherto missing members of sulfonium salts family in Salacia genus plants as a new class of a-glucosidase inhibitors, neoponkoranol (7) and neosalaprinol (8), were isolated from the water extracts, and their structures were unambiguously identified. For further SAR studies on this series of sulfonium salts, several epimers of 7 and 8 were synthesized, and their inhibitory activities against rat small intestinal alpha-glucosidases were evaluated. Among them, 3'-epimer of 7 was found most potent in this class of molecules, and revealed as potent as currently used antidiabetics, voglibose and acarbose. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and elucidation of absolute stereochemistry of salaprinol, another thiosugar sulfonium sulfate from the ayurvedic traditional medicine Salacia prinoides
摘要:
Synthesis and elucidation of absolute stereochemistry of salaprinol (3) isolated from the root and sterns of Salacia prinoides, which has been used for the treatment of diabetes in India, Sri Lanka, and Southeast Asia countries, is described. Compound 3 and its 2'-epimer, epi-salaprinol (epi-3) were synthesized via the coupling reaction of a cyclic sulfate, 2-O-benzylglycerol 1,3-cyclic sulfate (S), with a thiosugar, 1,4-dideoxy-1,4-epithio-D-arabinitol (6), as the key reaction, and S configuration of the asymmetric center in the side chain of 3 was elucidated by the X-ray crystallographic analysis. (C) 2008 Published by Elsevier Ltd.
Two hitherto missing members of sulfonium salts family in Salacia genus plants as a new class of a-glucosidase inhibitors, neoponkoranol (7) and neosalaprinol (8), were isolated from the water extracts, and their structures were unambiguously identified. For further SAR studies on this series of sulfonium salts, several epimers of 7 and 8 were synthesized, and their inhibitory activities against rat small intestinal alpha-glucosidases were evaluated. Among them, 3'-epimer of 7 was found most potent in this class of molecules, and revealed as potent as currently used antidiabetics, voglibose and acarbose. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and elucidation of absolute stereochemistry of salaprinol, another thiosugar sulfonium sulfate from the ayurvedic traditional medicine Salacia prinoides
Synthesis and elucidation of absolute stereochemistry of salaprinol (3) isolated from the root and sterns of Salacia prinoides, which has been used for the treatment of diabetes in India, Sri Lanka, and Southeast Asia countries, is described. Compound 3 and its 2'-epimer, epi-salaprinol (epi-3) were synthesized via the coupling reaction of a cyclic sulfate, 2-O-benzylglycerol 1,3-cyclic sulfate (S), with a thiosugar, 1,4-dideoxy-1,4-epithio-D-arabinitol (6), as the key reaction, and S configuration of the asymmetric center in the side chain of 3 was elucidated by the X-ray crystallographic analysis. (C) 2008 Published by Elsevier Ltd.