作者:David I. MaGee、Tammy C. Mallais、Peter D.M. Mayo、George M. Strunz
DOI:10.1016/j.tet.2006.02.014
日期:2006.4
During the investigation of the reaction of dichloroketene with cyclic enoxy-lactones and acyclic enoxy-ester substrates it was found that only the acylic variants effectively participated in the [2+2]-cycloaddition. Although a complete understanding of the reasons for this are lacking, molecular mechanics calculations do suggest that an out of plane twist of the cabonyl group in the acyclic compounds
在研究二氯乙烯与环状环氧内酯和非环状环氧酯底物的反应过程中,发现只有酰基变体有效地参与了[2 + 2]-环加成反应。尽管尚缺乏对此原因的完整理解,但分子力学计算确实表明,无环化合物中甲酰基的平面外扭曲可能是部分原因。在筛选了各种手性助剂后,发现当使用(R)-2,2-二苯基环戊醇作为手性助剂时,在该环加成反应中可以获得有用的非对映选择性(2.6-10.8:1)。