palladium-catalyzed cyclopropanation of internal alkenes with N-tosylhydrazones is presented. This gram-scale cyclopropanation reaction of maleimides provides a wide spectrum of 3-azabicyclo[3.1.0]hexane derivatives in high yields and diastereoselectivities. The major diastereoisomers could be easily isolated by chromatography on silica gel. This protocol provides a practical route to the mu opioid receptor
提出了
钯催化的内烯烃与N-
甲苯磺酰基hydr的
环丙烷化反应。马来
酰亚胺的这种克级
环丙烷化反应以高收率和非对映选择性提供了广谱的
3-氮杂双环[3.1.0]己烷衍
生物。可以通过
硅胶色谱法容易地分离出主要的非对映异构体。该方案提供了通往阿片类阿片受体拮抗剂CP-866,087的实用途径。