作者:Olivier Riant、Henri B. Kagan、Louis Ricard
DOI:10.1016/s0040-4020(01)89385-6
日期:1994.4
presence of catalytic amounts of various chiral β-aminoalcohols. The cycloadduct 3a has been obtained in excellent yield with enantiomeric excess of up to 61%. Its absolute configuration has been assigned by X-ray crystallography. Several features of the reaction have been studied: variation of dienophile; competition between cycloaddition and formation of the optically active Michael adduct 4; solvent
已经发现在催化量的各种手性β-氨基醇的存在下,蒽酮与N-甲基马来酰亚胺反应。已经以优异的产率获得了环加合物3a,对映体过量高达61%。其绝对构型已通过X射线晶体学确定。已经研究了反应的几个特征:亲双烯体的变化;环加成与旋光迈克尔加合物的形成之间的竞争4 ; 溶剂和温度的影响。机理研究与一致的[4 + 2]过程一致,提供了碱催化的不对称Diels-Alder反应的独特情况。