作者:Johan Legters、Lambertus Thijs、Binne Zwanenburg
DOI:10.1002/recl.19921110203
日期:——
Aziridine-2-carboxylic esters 1 were converted into 2H-azirine-2-carboxylic esters 4 in two steps. Treatment of 1 with tert-butyl hypochlorite in ether gave smooth N-chlorination. Reaction of N-chloroaziridines 2 with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or 1,4-diazabicyclo[2.2.2]-octane (DABCO) gave 2H-azirine-2-carboxylic esters 4 in moderate yields, with concomitant formation of aziridines 1
在两个步骤中将氮丙啶-2-羧酸酯1转化为2 H-氮嗪-2-羧酸酯4。用乙醚中的次氯酸叔丁酯处理1,得到平稳的N-氯化。的反应Ñ -chloroaziridines 2与1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)或1,4-二氮杂双环[2.2.2] -辛烷(DABCO),得到2H -azirine -2-羧酸酯4产量适中,同时形成氮丙啶1。氮丙啶1可以容易地Ñ溴代与Ñ溴代琥珀酰亚胺。但是,用碱处理N-溴氮丙啶3不会导致形成叠氮基。N-卤代氮丙啶2和3作为反相异构体的混合物存在,它们在溶液中缓慢互变。