Carbon-carbon bond-forming reactions of α-thioaryl carbonyl compounds for the synthesis of complex heterocyclic molecules.
Strategies for the formation of carbon-carbon bonds from the α-thioaryl carbonyl products of substituted lactams are described. Although direct functionalization is possible, a two step process of oxidation and magnesium-sulfoxide exchange has proven optimal. The oxidation step results in the formation of two diastereomers that exhibit markedly different levels of stability toward elimination, which is rationalized on the basis of quantum mechanical calculations and X-ray crystallography. Treatment of the sulfoxide with i-PrMgCl results in the formation of a magnesium enolate that will undergo an intramolecular Michael addition reaction to form two new stereogenic centers. The relationship between the substitution patterns of the sulfoxide substrate and the efficiency of the magnesium exchange reaction are also described.
Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States.
James E
JE
Biggs-Houck
Rebecca L
RL
Davis
Jingqiang
J
Wei
Brandon Q
BQ
Mercado
Marilyn M
MM
Olmstead
Dean J
DJ
Tantillo
Jared T
JT
Shaw
D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D018360:Crystallography, X-Ray; D006571:Heterocyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure
D006571:Heterocyclic Compounds; D002244:Carbon