A New Method for the Preparation of δ-Alkoxy-α,β-unsaturated Aldehydes and Polyenals
作者:Akihiko Ishida、Teruaki Mukaiyama
DOI:10.1246/bcsj.50.1161
日期:1977.5
TiCl4 and also in the coexistence of TiCl4 and Ti(OiPr)4 to give δ-alkoxy-α,β-unsaturated aldehydes (3–5) in good yields. In the presence of 1,8-diazabicyclo[5.4.0] undec-7-ene or 1,5-diazabicyclo[4.3.0]non-5-ene and molecular sieves 3A or 4A, the elimination reaction of δ-alkoxyl group of α,β-unsaturated aldehydes (3–5) proceeds smoothly to afford the corresponding polyenals in good yields.
二烯氧基硅烷 (2) 在 TiCl4 存在下以及 TiCl4 和 Ti(OiPr)4 共存下与缩醛反应,以良好的产率得到 δ-烷氧基-α,β-不饱和醛 (3-5)。在1,8-二氮杂双环[5.4.0]十一碳-7-烯或1,5-二氮杂双环[4.3.0]非5-烯和分子筛3A或4A存在下,δ-烷氧基的消除反应α,β-不饱和醛 (3-5) 的合成顺利进行,以良好的收率提供相应的多烯醛。