Simple organocatalysts in multi-step reactions: An efficient one-pot Morita-Baylis-Hillman-type α-hydroxymethylation of vinyl ketones followed by the convenient, temperature-controlled one-pot etherification using alcohols
作者:Marvin Mantel、Marian Guder、Jörg Pietruszka
DOI:10.1016/j.tet.2018.05.026
日期:2018.9
alcohols on a multi-gram scale in moderate to good overall yields and high purities. Furthermore, an application of the ether in the enantioselective synthesis of a common building block for total synthesis is shown, thus providing a gram-scale access from inexpensive bulk chemicals.
1,4-二氮杂双环[2.2.2]辛烷(DABCO)在单罐合成中用作通用催化剂:首先,通过使用低负荷的廉价DABCO催化从对甲醛中制备醇甲醛溶液。第二,用于烷基和芳族乙烯基酮的快速α-羟甲基化,产率高。第三步,相同的催化剂可用于Morita-Baylis-Hillman的可选的,可控温度的原位醚化产品具有多种克级数的醇,具有中等至良好的总收率和高纯度。此外,显示了醚在用于全合成的通用结构单元的对映选择性合成中的应用,从而提供了从廉价的散装化学品中获得克级的访问量。