(S)-(−)-camphor the chiral alcohols 1, 2 and 3 have been prepared; their acrylates II underwent TiCl2(OR)2-promoted Diels-Alder additions to cyclopentadiene giving efficiently in a predictable manner either the (2R)- or the (2S)-adducts III with up to virtually quantitative asymmetric induction.
从(R)-(+)-和从(S)-(-)-
樟脑开始,制备了手性醇1、2和3;他们的
丙烯酸酯II经过TiCl 2(OR)2促进的Diels-Alder加成到
环戊二烯中,以可预测的方式有效地产生(2R)-或(2S)-加合物III,几乎可以定量地产生不对称诱导。