Nickel(0) triethyl phosphite complex-promoted reaction of allylic acetates with thiols produced allylic sulfides with retention of configuration without allylic rearrangement. A similar reaction of allylic acetates with alcohols and phenols also proceeded with retention of regio- and stereochemistry.
Enantioselective Cyclopropanation with TADDOL-Derived Phosphate Ligands
作者:Arnaud Voituriez、André B. Charette
DOI:10.1002/adsc.200600351
日期:2006.11
The synthesis of new chiral TADDOL-derived phosphate ligands is described. The ligands were efficiently synthesized on a multi-gram scale in three steps starting from the readily available corresponding TADDOL and were fully characterized. An X-ray structure was obtained and compared to known BINOL-phosphates. Their use in the asymmetric Simmons–Smith cyclopropanation of both functionalized and unfunctionalized
Halide ion effects in the rhodium-catalyzed allylic substitution reaction using copper(I) alkoxides and enolates
作者:P.Andrew Evans、David K. Leahy、Laura M. Slieker
DOI:10.1016/j.tetasy.2003.08.044
日期:2003.11
enolates with a copper(I) halide salt provides the requisite nucleophiles to accomplish the stereospecific rhodium-catalyzedallylic substitution. These studies demonstrate that the nature of the halide ion derived from the copper(I) salt has a profound effect on regioselectivity and enantiospecificity. This observation was attributed to the trans-effect, by virtue of an in situ modification of the catalyst
Regio- and Enantiospecific Rhodium-Catalyzed Allylic Etherification Reactions Using Copper(I) Alkoxides: Influence of the Copper Halide Salt on Selectivity
作者:P. Andrew Evans、David K. Leahy
DOI:10.1021/ja026337d
日期:2002.7.1
The transition metal-catalyzed allylic etherification represents a fundamentally important cross-coupling reaction for the construction of allylic ethers. We have developed a new regio- and enantiospecific rhodium-catalyzed allylic etherification of acyclic unsymmetrical allylic alcohol derivatives using copper(I) alkoxides derived from primary, secondary and tertiary alcohols. This study demonstrates