Chlorotrimethylsilane-mediated Michael addition reactions of chiral benzylic anions derived from η6-chromiumtricarbonyl complexes
作者:Rohan E.J Beckwith、Nicola Heron、Nigel S Simpkins
DOI:10.1016/s0022-328x(02)01590-5
日期:2002.9
Michael adducts are greatly improved in the presence of Me3SiCl. Some further transformations of the Michael adducts were carried out, including a ring expansion process of a cyclohexanone derivative and a SmI2 mediated cyclisation of a complex bearing an acyclic ketone appendage.
Chiral base-mediated asymmetric functionalisation of tricarbonylchromium(0) complexes of benzyl sulfides
作者:Susan E. Gibson、Peter Ham、Gary R. Jefferson、Mark H. Smith
DOI:10.1039/a704252c
日期:——
Chiral base-mediated asymmetric functionalisation of
tricarbonylchromium(0) complexes of benzyl sulfides gives, after
crystallisation, products of high enantiomeric purity (92–99% ee)
in acceptable yield (51–76%); an intriguing reversal of
stereoselectivity with respect to the analogous oxygen systems is
noted.