Design and synthesis by click triazole formation of paclitaxel mimics with simplified core and side-chain structures
摘要:
A library of paclitaxel (taxol) mimics was obtained by a straightforward strategy involving rational design and an efficient synthesis of a simplified taxane core substitute, together with a click-chemistry combinatorial search for phenylisoserine side-chain surrogates. (c) 2011 Elsevier Ltd. All rights reserved.
Radical-Based Asymmetric Synthesis: An Iterative Approach to 1, 3, 5, ... (2<i>n</i> + 1) Polyols
作者:Philip Garner、James T. Anderson
DOI:10.1021/ol990188v
日期:1999.10.1
[formula: see text] A conceptually novel approach to 1, 3, 5, ... (2n + 1) polyols based on iterative stereo-controlled homologation of chiral hydroxyalkyl radicals is reported. Starting from alpha-keto ester precursors, the general sequence of (1) ketone reduction, (2) auxiliary attachment, (3) saponification, (4) Barton esterification, and (5) radical addition provided the two-carbon homologue in
Looking glass inhibitors: scalable syntheses of DNJ, DMDP, and (3R)-3-hydroxy-l-bulgecinine from d-glucuronolactone and of l-DNJ, l-DMDP, and (3S)-3-hydroxy-d-bulgecinine from l-glucuronolactone. DMDP inhibits β-glucosidases and β-galactosidases whereas l-DMDP is a potent and specific inhibitor of α-glucosidases
作者:Daniel Best、Chen Wang、Alexander C. Weymouth-Wilson、Robert A. Clarkson、Francis X. Wilson、Robert J. Nash、Saori Miyauchi、Atsushi Kato、George W.J. Fleet
DOI:10.1016/j.tetasy.2010.01.017
日期:2010.3
A convenient large-scale synthesis of 1-deoxynojirimyin (DNJ) from D-glucuronolactone involves introduction of azide at C-5 with retention of configuration to give 5-azido-5-deoxy-1,2-O-isopropylidene-alpha-D-glucofuranose as a key intermediate in an overall yield of up to 72%; the same intermediate can be transformed into DMDP (2R,3R,4R,5R)-2,5-bis(hydroxymethyl)pyrrolidine-3,4-diol] and (3R)-3-hydroxy-L-bulgecinine [(2S,3R,4R,5R)-3,4-dihydroxy-5-hydroxymethyl-L-proline]. L-Glucuronolactone, a readily available L-sugar chiron, may similarly be used to access the enantiomers L-DNJ, L-DMDP, and (3S)-3-hydroxy-D-bulgecinine. A comparison of glycosidase inhibition by DMDP (an inhibitor of beta-glucosidases and beta-galactosidases) and L-DMDP (a potent and specific alpha-glucosidase inhibitor) with the corresponding enantiomeric hydroxybulgecinines is reported; DMDP and (3R)-3-hydroxy-L-bulgecinine show weak inhibition of glycogen phosphorylase. (C) 2010 Elsevier Ltd. All rights reserved.
Large scale synthesis of the acetonides of l-glucuronolactone and of l-glucose: easy access to l-sugar chirons
作者:Alexander C. Weymouth-Wilson、Robert A. Clarkson、Nigel A. Jones、Daniel Best、Francis X. Wilson、Maria-Soledad Pino-González、George W.J. Fleet
DOI:10.1016/j.tetlet.2009.08.124
日期:2009.11
1,2-O-Isopropylidene-alpha-L-glucurono-3,6-lactone may be synthesized on a 100-200 g scale from cheaply available D-glucoheptonolactone in an overall yield of 94% in four steps Via L-glucuronolactone. Subsequent elaboration to L-glucose, diacetone-L-glucose (1,2:5,6-di-O-isopropylidene-alpha-L-glucofuranose), and monoacetone-L-glucose (1,2-O-isopropylidene-alpha-L-glucofuranose) allows easy access to a range of L-sugar chirons. (C) 2009 Elsevier Ltd. All rights reserved.