Synthesis of 1,4-anhydro-D-xylitol heteroanalogues of the naturally occurring glycosidase inhibitor salacinol and their evaluation as glycosidase inhibitors
摘要:
本文介绍了两个1,4-脱水-D-木糖醇杂环类似物(8和9),它们含有一个硫或氮原子的环,是天然存在的亚磺酸盐离子salacinol(3)的合成方法。Salacinol(3)是Sri Lanka和India传统用于2型糖尿病治疗的Salacia reticulata水提取物中的有效成分之一。合成策略依赖于硫或氮类似物1,4-脱水-D-木糖醇的亲核攻击2,4-O-苯甲酰亚甲基-L-赤藓醇-1,3-环状硫酸酯的最不妨碍碳。亚磺酸盐离子8抑制了大麦α-淀粉酶(AMY1)和猪胰腺α-淀粉酶(PPA),其K i 值分别为109 ± 11和55 ± 5 µM。相比之下,铵离子9对AMY1或PPA均未显示出显著抑制作用。化合物8和9也未显示出对葡萄糖淀粉酶的显著抑制作用。关键词:糖苷酶抑制剂,salacinol类似物,脱水-D-木糖醇杂环类似物,酶抑制。
Total Synthesis Without Protecting Groups: Pyrrolidines and Cyclic Carbamates
摘要:
A protecting group free synthesis of 2,3-cis substituted hydroxypyrrolidines is reported. Two novel reaction methodologies allow for the stereoselective formation of cyclic carbamates from olefinic amines, and the formation of primary amines via a Vasella/reductive amination reaction, both performed in aqueous media.
The Efficient, Enantioselective Synthesis of Aza Sugars from Amino Acids. 1. The Polyhydroxylated Pyrrolidines
作者:Yifang Huang、David R. Dalton、Patrick J. Carroll
DOI:10.1021/jo962028s
日期:1997.1.1
(+)-serine or (-)-serine, as appropriate, convenient, high-yield, enantioselective synthesis of all eight stereoisomeric 2-hydroxymethyl-3,4-dihydroxypyrrolidines (the enantiomeric pairs of iminoribitol, -arabinitol, -xylitol, and -lyxitol) can be effected. The absolute configuration of the starting amino acid defines the set of azasugars produced.
highly efficient method for the synthesis of 1,4-dideoxy-1,4-imino-d- and l-arabinitol (d-AB1, 1 and l-AB1, 3) and 1,4-dideoxy-1,4-imino-d- and l-xylitol (d-DIX, 2 and l-DIX, 4) starting from commercially available chiral aziridines was developed. The generalstrategy employs a sequence involving two-carbon homologation, dihydroxylation, and regioselective aziridine ring opening/intramolecular five-membered
Identification of the 2-hydroxymethyl-3,4-dihydroxypyrrolidine (or 1,4-dideoxy-1,4-iminopentitol) from and from as the (2R, 3R, 4S)-isomer by the synthesis of its enantiomer.
作者:D.Wyn C. Jones、Robert J. Nash、E.Arthur Bell、J.Michael Williams