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.