Highly Substituted Homoallylvinylcyclopropanes by Indium-Mediated Reaction of α,β-Unsaturated Ketones and Aldehydes with Allylic Halides
作者:Stephen M. Capps、Timothy P. Clarke、Jonathan P. H. Charmant、Henning A. F. Höppe、Guy C. Lloyd-Jones、Martin Murray、Torren M. Peakman、Rosie A. Stentiford、Kenneth E. Walsh、Paul A. Worthington
DOI:10.1002/(sici)1099-0690(200003)2000:6<963::aid-ejoc963>3.0.co;2-1
日期:2000.3
reaction of bis(p-chlorobenzylidine)acetone was confirmed by X-ray crystallography. Whilst bis-α,β−unsaturated ketones give rise to a single homoallylcyclopropane species, α,β-unsaturated ketones and aldehydes give diastereomeric mixtures whose relative stereochemistry were assigned by NOE experiments. Crotylindium reagents react with good to perfect regioselectivity to afford tetrasubstituted cyclopropanes
烯丙基试剂由过量的烯丙基卤化物(Br 或 I)和铟金属制备,与 α,β-不饱和酮和醛反应,经过有氧酸性处理后,得到高烯丙基取代的乙烯基环丙烷。该过程是在 Pd 催化过程中的副反应偶然发现后探索和开发的。由双(对氯苄基)丙酮反应产生的环丙烷的结构已通过 X 射线晶体学证实。虽然双-α,β-不饱和酮产生单一的高烯丙基环丙烷物质,但α,β-不饱和酮和醛产生非对映异构混合物,其相对立体化学由 NOE 实验指定。