Enantioselective Michael addition of α,α-disubstituted aldehydes to maleimides organocatalyzed by chiral primary amine-guanidines
作者:Angel Avila、Rafael Chinchilla、Carmen Nájera
DOI:10.1016/j.tetasy.2012.11.002
日期:2012.12
New primary amine-guanidines derived from the monoguanylation of (1S,2S)- and (1R,2R)-cyclohexane-1,2-diamine have been prepared and used as chiral organocatalysts for the enantioselective conjugate addition of α,α-disubstituted aldehydes to maleimides. The corresponding Michael adducts bearing a new stereocenter were generally obtained in high or quantitative yields and with good enantioselectivities
制备了由(1 S,2 S)-和(1 R,2 R)-环己烷-1,2-二胺单胍化衍生的新伯胺-胍,并将其用作手性有机催化剂,用于α的对映选择性共轭加成, α-二取代醛为马来酰亚胺。带有新的立体中心的相应的迈克尔加合物通常以高产率或定量产率获得并且具有良好的对映选择性(高达93%ee)。