A series of allyl bromides 3a-c bearing a stereogenic carbon substituent at C-2 are synthesised in four steps from methyl acrylate. These are found to react with aldehydes, mediated by chromium(II) chloride, to furnish syn-4-alkoxyalkan-1-ols 4 in good to excellent diastereoselectivity.
由
丙烯酸甲酯分四个步骤合成一系列在C-2上带有立体碳取代基的烯丙基
溴3a-c。发现它们与由
氯化
铬(II)介导的醛反应,从而以优异的非对映选择性提供顺式4-烷氧基烷基-1-醇4。