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Synthesis of amido-spiro[2.2]pentanes via Simmons-Smith cyclopropanation of allenamides

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ORGANIC & BIOMOLECULAR CHEMISTRY
卷 7, 期 16, 页码 3331-3337

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ROYAL SOC CHEMISTRY
DOI: 10.1039/b908205k

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  1. NIH-NIGMS [GM066055]
  2. NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM066055] Funding Source: NIH RePORTER

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A detailed account of Simmons-Smith cyclopropanations of allenamides en route to amido-spiro[2.2]pentanes is described here. While the diastereoselectivity was low when using unsubstituted allenamides, the reaction is overall efficient and general, representing the most direct synthesis of both chemically and biologically interesting amido-spiro[2.2]pentane systems. With alpha-substituted allenamides, while the diastereoselectivity could be improved significantly based on a series of conformational analyses, both mono- and bis-cyclopropanation products were observed. Consequently, several structurally intriguing amido-methylene cyclopropanes could also be prepared.

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