Camphor-Based α-Bromo Ketones for the Asymmetric Darzens Reaction
作者:Claudio Palomo、Mikel Oiarbide、Arun K. Sharma、M. Concepción González-Rego、Anthony Linden、Jesús M. García、Alberto González
DOI:10.1021/jo001031f
日期:2000.12.1
(1R)-2-endo-Bromoacetyl-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol (endo-2-bromoacetylisoborneol) 4 and its trimethylsilyl ether 3 are presented as efficient reagents for the asymmetric Darzens reaction. From the alpha,beta-epoxy ketone adducts the chiral inductor camphor is removed, by treatment with ceric(IV) ammonium nitrate, to yield the corresponding epoxy acids which are isolated as their dicyclohexylammonium