Enzyme-catalyzed aldol condensation for asymmetric synthesis of azasugars: synthesis, evaluation, and modeling of glycosidase inhibitors
摘要:
A combined fructose 1,6-diphosphate aldolase reaction and catalytic reductive amination has been used in the asymmetric synthesis of azasugars structurally corresponding to N-acetylglucosamine, N-acetylmannosamine, and deoxyhexoses. The 6-deoxyazasugars were prepared by direct hydrogenolysis of the aldolase product without removal of the 6-phosphate group. Both (R)- and (S)-3-azido-2-acetamidopropanal used as substrates in the aldolase reactions were prepared from the corresponding lipase-resolved 2-hydroxy species followed by formation of an aziridine intermediate and opening of the aziridine with azide. Evaluation of these azasugars and their diastereomerically pure tertiary amine oxides as well as 5-thioglucose and its sulfoxide derivatives as glycosidase inhibitors was carried out. It was found that all synthetic azasugars and 5-thioglucose were strong inhibitors, but oxidation of the ring heteroatom weakened the inhibition. With the aid of molecular modeling and inhibition analysis, a structure-K(i) relation of inhibitors was established which provides useful information for the design of new glycosidase inhibitors.
Enzyme-catalyzed aldol condensation for asymmetric synthesis of azasugars: synthesis, evaluation, and modeling of glycosidase inhibitors
摘要:
A combined fructose 1,6-diphosphate aldolase reaction and catalytic reductive amination has been used in the asymmetric synthesis of azasugars structurally corresponding to N-acetylglucosamine, N-acetylmannosamine, and deoxyhexoses. The 6-deoxyazasugars were prepared by direct hydrogenolysis of the aldolase product without removal of the 6-phosphate group. Both (R)- and (S)-3-azido-2-acetamidopropanal used as substrates in the aldolase reactions were prepared from the corresponding lipase-resolved 2-hydroxy species followed by formation of an aziridine intermediate and opening of the aziridine with azide. Evaluation of these azasugars and their diastereomerically pure tertiary amine oxides as well as 5-thioglucose and its sulfoxide derivatives as glycosidase inhibitors was carried out. It was found that all synthetic azasugars and 5-thioglucose were strong inhibitors, but oxidation of the ring heteroatom weakened the inhibition. With the aid of molecular modeling and inhibition analysis, a structure-K(i) relation of inhibitors was established which provides useful information for the design of new glycosidase inhibitors.
Iminocyclitol inhibitors of hexoaminidase and glycosidase
申请人:The Scripps Research Institute
公开号:US20040198772A1
公开(公告)日:2004-10-07
Designed imminocyclitols have potent inhibition activity with respect to hexoaminidases and glycosidases.
设计的免疫环糖醇具有对于己糖氨酸酶和醣苷酶的强烈抑制活性。
Enzyme-catalyzed aldol condensation for asymmetric synthesis of azasugars: synthesis, evaluation, and modeling of glycosidase inhibitors
作者:Tetsuya Kajimoto、Kevin K. C. Liu、Richard L. Pederson、Ziyang Zhong、Yoshitaka Ichikawa、John A. Porco、Chi Huey Wong
DOI:10.1021/ja00016a039
日期:1991.7
A combined fructose 1,6-diphosphate aldolase reaction and catalytic reductive amination has been used in the asymmetric synthesis of azasugars structurally corresponding to N-acetylglucosamine, N-acetylmannosamine, and deoxyhexoses. The 6-deoxyazasugars were prepared by direct hydrogenolysis of the aldolase product without removal of the 6-phosphate group. Both (R)- and (S)-3-azido-2-acetamidopropanal used as substrates in the aldolase reactions were prepared from the corresponding lipase-resolved 2-hydroxy species followed by formation of an aziridine intermediate and opening of the aziridine with azide. Evaluation of these azasugars and their diastereomerically pure tertiary amine oxides as well as 5-thioglucose and its sulfoxide derivatives as glycosidase inhibitors was carried out. It was found that all synthetic azasugars and 5-thioglucose were strong inhibitors, but oxidation of the ring heteroatom weakened the inhibition. With the aid of molecular modeling and inhibition analysis, a structure-K(i) relation of inhibitors was established which provides useful information for the design of new glycosidase inhibitors.