STEREOCHEMICAL FEATURES OF CYCLOADDITION OF HETEROAROMATIC<i>N</i>-YLIDES. SELECTIVE PARTICIPATION OF THE ANTI AND SYN YLIDES
作者:Otohiko Tsuge、Shuji Kanemasa、Shigeori Takenaka
DOI:10.1246/cl.1985.355
日期:1985.3.5
In the cycloaddition of heteroaromatic N-ylides to symmetrically substituted trans olefins, the anti ylide exclusively participates if the ylide is carbonyl-stabilized, while the syn ylide does if it has a substituent of non-carbonyl type. The cycloadducts isomerize into thermodynamically more stable isomers through a retro reaction.
在杂芳族 N-叶立德与对称取代的反式烯烃的环加成反应中,如果叶立德是羰基稳定的,则反叶立德仅参与,而如果它具有非羰基类型的取代基,则顺立德参与。环加合物通过逆反应异构化为热力学更稳定的异构体。