Both substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles have been synthesized by the 3+2 intramolecular dipolar cycloaddition of nitrilimines to alkynes. This cyclization has been extended to more versatile 3-bromo derivatives by the use of alkynylbromides as dipolarophiles.
取代的2,4,5,6-四氢环戊[ c ]
吡唑和2,4,5,6-
四氢吡咯并[3,4- c ]
吡唑是通过亚
硝胺的3 + 2分子内偶极环加成反应而合成的。通过使用炔基
溴化物作为亲双性体,这种环化作用已扩展为更通用的3-
溴衍
生物。