Expeditious and efficient annulation protocol for the synthesis of α,β-unsaturated δ-lactones from β-keto esters
作者:A. Nangia、P. Bheema Rao
DOI:10.1016/s0040-4039(00)74216-x
日期:1992.4
β-Keto esters 6a–3 are transformed into β-keto alcohols 7a–3, which are homologated to phosphonates 9a–e. Intramolecular Horner-Wadsworth-Emmons reaction affords δlactones 10a–d in excellent overall yields.
β-酮酸酯6a–3转化为β-酮醇7a–3,它们与膦酸酯9a–e同源。分子内霍纳-沃兹沃思-埃蒙斯反应可提供出色的总收率的δ内酯10a-d。