XY–ZH systems as potential 1,3-dipoles. Part 9. Aza-allyl anion precursors from the reaction of (1,3-dioxoindan-2-ylidene)malononitrile with α-amino acids and their methyl esters
作者:Ronald Grigg、Theeravat Mongkolaussavaratana
DOI:10.1039/p19880000541
日期:——
Glycine, valine, and α-amino acid esters react with (1,3-dioxoindan-2-ylidene)malononitrile (1) by a Michael addition–elimination mechanism with replacement of one cyano group by the α-amino acid or α-amino acid ester entity. These adducts undergo a triethylamine-catalysed stereospecific cycloaddition to N-methylmaleimide at room temperature with loss of the remaining cyano group in > 70% yield. The
甘氨酸,缬氨酸和α-氨基酸酯通过迈克尔加成-消除机理与(1,3-二氧杂茚满-2-亚基)丙二腈(1)反应,其中一个氰基被α-氨基酸或α-氨基取代酸酯实体。这些加合物在室温下经历三乙胺催化的立体有择环加成反应至N-甲基马来酰亚胺,而剩余的氰基损失> 70%。认为环加成是涉及氢键合的氮杂-烯丙基阴离子的[3 + 2]阴离子环加成。