Looking glass inhibitors: both enantiomeric N-benzyl derivatives of 1,4-dideoxy-1,4-imino-d-lyxitol [a potent competitive inhibitor of α-d-galactosidase] and of 1,4-dideoxy-1,4-imino-l-lyxitol [a weak competitive inhibitor of α-d-galactosidase] inhibit naringinase, an α-l-rhamnosidase competitively
摘要:
Benzhydryl protection by diphenyldiazomethane of an alcohol in enantiomeric base-sensitive ribonolactones allows short efficient syntheses of 1,4-dideoxy-1,4-imino-D-lyxitol (DIL) and of 1,4-dideoxy-1,4-imino-L-lyxitol (LIL). DIL showed potent [K-i = 0.13 mu M]-and LIL showed weak [K-i = 113 mu M]-competitive inhibition of alpha-D-galactosidase. Both enantiomers N-benzyl-DIL [K-i = 64 mu M] and N-benzyl-LIL [K-i = 13 mu M] were moderate competitive inhibitors of naringinase, an alpha-L-rhamnosidase. (C) 2009 Elsevier Ltd. All rights reserved.
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.
Here, we report a chemoenzymatic approach for the preparation of a small panel of biologically important iminosugars from readily available aldoses, employing a transaminase in combination with Gluconobacter oxydans whole cells.
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.