Cyclopropyl Building Blocks for Organic Synthesis, 139. Ethyl Cyclopropylidenepyruvate as a Novel Multifunctional Cyclopropyl Building Block: Facile Preparation and Basic Reaction Patterns
作者:Viktor Bagutski、Armin de Meijere
DOI:10.1002/adsc.200600617
日期:2007.5.7
chloride-mediated Barbier-type coupling of ethyl glyoxylate with 2,3-dibromopropene followed by Simmons–Smith cyclopropanation and subsequent Dess–Martin oxidation, afforded ethyl 3-(1-bromocycloprop-1-yl)-2-oxopropionate (5), a stable precursor of ethyl cyclopropylidenepyruvate (1j), in good overall yield (65 %), even on a multi-gram scale. The potentially rich chemistry of this novel cyclopropyl building