Highly diastereoselective reduction of β-ketophosphonates bearing homochiral bis(α-methylbenzyl)amine: preparation of both enantiomers of phosphogabob (GABOBP)
摘要:
The reduction of dimethyl 3-N,N-di(alpha-methylbenzyl)amino-2-ketophosphonates 9 with catecholborane at -78degreesC in presence of LiClO4, gave gamma-amino-beta-hydroxyphosphonates 10 and 11 in good yield and with excellent diastereoselectivity. This procedure represents an example of highly diastereoselective 1,4-induction. The hydrolysis and hydrogenation of 10 and 11 afforded the (R)- and (S)-gamma-amino-beta-hydroxypropylphosphonic acid (GABOB(P)), respectively. (C) 2004 Elsevier Ltd. All rights reserved.
Highly diastereoselective reduction of β-ketophosphonates bearing homochiral bis(α-methylbenzyl)amine: preparation of both enantiomers of phosphogabob (GABOBP)
The reduction of dimethyl 3-N,N-di(alpha-methylbenzyl)amino-2-ketophosphonates 9 with catecholborane at -78degreesC in presence of LiClO4, gave gamma-amino-beta-hydroxyphosphonates 10 and 11 in good yield and with excellent diastereoselectivity. This procedure represents an example of highly diastereoselective 1,4-induction. The hydrolysis and hydrogenation of 10 and 11 afforded the (R)- and (S)-gamma-amino-beta-hydroxypropylphosphonic acid (GABOB(P)), respectively. (C) 2004 Elsevier Ltd. All rights reserved.
Use of Bis-(chiral α-methylbenzyl)glycine Esters for Synthesis of Enantiopure β-Hydroxyamino Esters
作者:Ayako Yamashita、Emily B. Norton、R. Thomas Williamson、Douglas M. Ho、Sandra Sinishtaj、Tarek S. Mansour
DOI:10.1021/ol030085j
日期:2003.9.1
[reaction: see text] Aldol reactions using bis-(chiral alpha-methylbenzyl)glycine esters with aldehydes gave excellent diastereoselectivity. Thus, an enantiopure ribosylglycine was prepared for the synthesis of analogues of the natural antibiotics muraymycin. This method was extended for formation of beta-hydroxyamino esters.