作者:Richard J. Petroski
DOI:10.1080/00397910701569114
日期:2007.10.1
Abstract New phosphonate reagents were developed for the two‐carbon homologation of aldehydes to unbranched or methyl‐branched unsaturated aldehydes. The phosphonate reagents, diethyl methylformylphosphonate dimethylhydrazone and diethyl ethylformyl‐2‐phosphonate dimethylhydrazone, contained a protected aldehyde group instead of the usual ester group. A homologation cycle entailed condensation of the
摘要 开发了新的膦酸酯试剂,用于醛与直链或甲基支链不饱和醛的双碳同系化。膦酸酯试剂,二乙基甲基甲酰基膦酸酯二甲基腙和二乙基乙基甲酰基-2-膦酸酯二甲基腙,含有受保护的醛基而不是通常的酯基。同系化循环需要将试剂与起始醛缩合,然后用 1 M HCl 和石油醚的双相混合物去除二甲基腙保护基团。这种稳健的两步法适用于脂肪族醛、α,β-不饱和醛和芳香醛。缩合步骤的分离产率范围为 77% 至 89%,脱保护步骤的产率范围为 81% 至 96%。