Synthese von Phosphono�pfels�ureestern durch Reduktion von 3-Phosphonopyruvaten
摘要:
The reduction of 3-phosphonopyruvates with ammonia-borane complex proceeds with a very high diastereoselectivity (25:1). Syn- and anti-diastereoisomeric hydroxy esters could be unambiguously assigned by NMR spectroscopy. Furthermore, other beta-ketophosphonates could easily be reduced. Thus, diethyl-3,3-diethoxy-2-hydroxybutyl phosphonate was obtained which gave diethy-2-hydroxy-3-oxobutyl phosphonate after hydrolysis the first known phosphonoacyloine.