Asymmetric hetero-Diels–Alder reaction of 1-alkyl-3-silyloxy-1,3-dienes with ethyl glyoxylate catalyzed by a chiral (salen)cobalt(II) complex
作者:Lian-Sheng Li、Yikang Wu、Yun-Jin Hu、Li-Jun Xia、Yu-Lin Wu
DOI:10.1016/s0957-4166(98)00204-3
日期:1998.7
1-(2-benzyloxyethyl)-3-(tert-butyldimethylsilyl)oxy-1,3-butadiene with ethyl glyoxylate gave the Diels–Alder product in 75% isolated yield with the endo:exo ratio >99:1 and the enantiomeric excess ≥52%. The effects of temperature, catalyst and solvent are also discussed.
对1-烷基-3-(叔丁基二甲基甲硅烷基)氧基-1,3-丁二烯与乙醛酸乙酯的手性salen-金属配合物催化的杂Diels-Alder反应进行了研究。以钴(II)配合物为催化剂,1-(2-苄氧基乙基)-3-(叔丁基二甲基甲硅烷基)氧基-1,3-丁二烯与乙醛酸乙酯的反应得到Diels–Alder产品,分离产率为75%与内型:外型比> 99:1对映体过量≥52%。还讨论了温度,催化剂和溶剂的影响。