The chiral formylferrocenes 2-5 have been readily prepared in good yields by ortho-lithiation of the TMS-blocked orunblocked aminoferrocenes and subsequent reaction with DMF. The stereochemistry of the reaction of 2 with organometallic reagents has been examined. Reactions of 2 with Grignard and org
Alkaloid catalysed asymmetric synthesis. The addition of selenophenols to 2-cyclohexen-1-ones and conversion to optically active allylic alcohols
โ Scribed by Henk Pluim; Hans Wynberg
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- French
- Weight
- 211 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
The cinchona alkaloid catalyzed 1,Caddltlon reaction of selenophenols to cyclohexenols has been shown to proceed with asyannetric lnductlon. Optically active selenium adducts are formed in quantitative chemical and up to 43% enanticmeric yields. The transformation to an optically active chiral ally1 alcohol is described.
๐ SIMILAR VOLUMES
The addition of mercaptans to a,B-unsaturated systems is an important reaction in biosynthetic processes2 as well as in synthesis.3 We wish to report the formation in excellent yields of a series of B-ketosulfides in enantiomeric excess up to 50% by the addition of mercaptans to 2-cyclohexene-l-one