作者:M. José Alves、Thomas L. Gilchrist、João H. Sousa
DOI:10.1039/a901145e
日期:——
Reactions of the methyl 2-aryl-2H-azirine-3-carboxylates 1a and 1b with nucleophiles are described. Thiols add to the CN bond to give aziridines 4–6. Propargyl alcohol similarly gives the aziridine 7. Primary and secondary aliphatic amines react with the azirines to give methyl 3-aminoacrylates 8–12. 4-Cyclohexen-1-ylmorpholine and 1-cyclopenten-1-ylpyrrolidine react with the azirine 1a to give products formulated as the aziridine 13 and the vinylidenecyclopentanone 14, respectively, in contrast to previously reported reactions of enamines with azirines from which pyrroles were isolated. Acetylacetone gives a pyrrole-3-carboxylate 15 in low yield with the azirine 1a. All these products have been rationalised by invoking initial addition of the nucleophile to the CN bond of the azirine. The tetrahydrofuran-2-yl radical also adds to the CN bond of the azirine 1a, giving the aziridine 16 as a single diastereoisomer. X-Ray crystal structures of methyl (E)-3-amino-3-(2,6-dichlorophenyl)-2-morpholin-4-ylpropenoate 8 and of methyl 3-(2,6-dichlorophenyl)-2-(tetrahydrofuran-2-yl)aziridine-2-carboxylate 16 are reported.
描述了2-芳基-2H-氮丙啶-3-羧酸甲酯1a和1b与亲核试剂的反应。硫醇加到 CN 键上得到氮丙啶 4-6。类似地,丙炔醇生成氮丙啶7。脂肪族伯胺和仲胺与氮丙啶反应生成3-氨基丙烯酸甲酯8-12。 4-环己烯-1-基吗啉和1-环戊烯-1-基吡咯烷与氮丙啶1a反应,分别得到配制成氮丙啶13和亚乙烯基环戊酮14的产物,这与之前报道的烯胺与氮丙啶反应(从中分离出吡咯)相反。乙酰丙酮与氮丙啶 1a 一起以低产率生成吡咯-3-羧酸酯 15。所有这些产品均通过亲核试剂最初加成到氮丙啶的 CN 键上而合理化。四氢呋喃-2-基也加到氮丙啶1a的CN键上,得到单一非对映异构体氮丙啶16。 (E)-3-氨基-3-(2,6-二氯苯基)-2-吗啉-4-基丙烯酸甲酯8和3-(2,6-二氯苯基)-2-(四氢呋喃)甲酯的X射线晶体结构报道了-2-基)氮丙啶-2-羧酸酯16。