Chiral amide from (1S, 2R)-(+)-norephedrine and furoic acid: An efficient catalyst for asymmetric Reformatsky reaction
作者:NALLAMUTHU ANANTHI、SIVAN VELMATHI
DOI:10.1007/s12039-013-0533-4
日期:2014.1
Chiral amide derived from (1S, 2R)-(+)-norephedrine and 2-furoic acid was found to catalyse the asymmetric Reformatsky reaction between prochiral aldehydes and α-bromo ethylacetate with diethylzinc as zinc source. The corresponding chiral β-hydroxy esters were formed in 99% yield with over 80% enantiomeric excess. The presence of air was found to be essential for the effective C-C bond formation. The
发现由(1 S,2 R)-(+)-去氧麻黄碱和2-糠酸衍生的手性酰胺以二乙基锌为锌源催化前手性醛与α-溴代乙酸乙酯的不对称Reformatsky反应。以99%的收率和超过80%的对映体过量形成相应的手性β-羟基酯。发现空气的存在对于有效形成CC键至关重要。提出了催化反应的机理。 发现由(1 S,2 R)-(+)-去氧麻黄碱和2-糠酸合成的手性配体(CL)催化不对称的Reformatsky反应。在某些情况下,形成手性产物的产率为95%,ee超过90%。发现空气的存在对于有效的CC键形成是必不可少的。