Carbon鈥揅arbon Bond-Forming Reactions of 伪-Thioaryl Carbonyl Compounds for the Synthesis of Complex Heterocyclic Molecules

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• 作者：James E. Biggs-Houck ; Rebecca L. Davis ; Jingqiang Wei ; Brandon Q. Mercado ; Marilyn M. Olmstead ; Dean J. Tantillo ; Jared T. Shaw
• 刊名：The Journal of Organic Chemistry
• 出版年：2012
• 出版时间：January 6, 2012
• 年：2012
• 卷：77
• 期：1
• 页码：160-172
• 全文大小：639K
• 年卷期：v.77,no.1(January 6, 2012)
• ISSN：1520-6904

文摘

Strategies for the formation of carbon鈥揷arbon bonds from the 伪-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.