The effect of cations on the asymmetric conjugate addition of organocopper reagents to chiral vinyl sulfoximines
β Scribed by Stephen G. Pyne
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- French
- Weight
- 245 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The chiral vinyl sulfsximines lb and q have been prepared. The effect of cations -(Li+, Zn'+) on the stereochemical outcome of their conjugate addition reactions with organocopper reagents is reported.
Recently we reported that chiral vinyl sulfoximines la underwent conjugate addition reactions with dialkylcopper lithium reagents (R2CuLi. LiI) to yield a mixture of two
π SIMILAR VOLUMES
A survey of conjugate additions of Yamamoto organocopper reagents to N-enoyl-4-substituted oxazolidinones is reported. Diastereofacial selectivity is reversed for 4-phenyl and 4-benzyloxazolidinones of the same relative configuration. Alkenylcopper reagents demonstrate superior results in asymmetric
## Abstract For Abstract see ChemInform Abstract in Full Text.
The copper-catalyzed conjugate addition of Grignard reagents to enones in the presence of chiral diselenide oxazoline ligands has been studied and found to provide good yields and useful levels of asymmetric induction.
The copper catalyzed conjugate addition of n-butyl Grignard to enones in the presence of chiral ferrocenyl phosphine oxazoline ligands has been studied and found to provide useful levels of asymmetric induction. A comparison of the ferrocene derived ligands 3 and 6 with the corresponding phenyl deri