<i>Diels</i>-<i>Alder</i>Regioselectivity Controlled by Remote Substituents. The Cycloadditions of 1-(Dimethoxymethyl)-2,3-dimethylidene- and -2,3,5,6-tetramethylidene-7-oxabicyclo[2.2.1]heptanes
作者:Jean-Lue Métral、JüRgen Lauterwein、Pierre Vogel
DOI:10.1002/hlca.19860690603
日期:1986.9.10
and 6 controls the regioselectivity of the Lewis-acid-catalyzed Diels-Alder additions with methyl vinyl ketone and butynone. For the EtAlCl2-catalyzed addition of methyl vinyl ketone to 6, the regioselectivity can be reversed by a small solvent modification. The tetraene 2 is a versatile reagent for regioselective ‘tandem’ cycloadditions.
报告了在位置C(1)上取代的2,3-二甲基-和2,3,5,6-四亚甲基-7-氧杂双环[2.2.1]庚烷的合成。衍生物2和6中的1-二甲氧基甲基基团控制路易斯酸催化的狄尔斯-阿尔德与甲基乙烯基酮和丁炔酮的区域选择性。对于EtAlCl 2催化的甲基乙烯基酮加成到6,可以通过少量的溶剂改性来逆转区域选择性。四烯2是用于区域选择性“串联”环加成的通用试剂。