Copper-Catalyzed Chan–Lam Cyclopropylation of Phenols and Azaheterocycles
作者:Joseph Derosa、Miriam L. O’Duill、Matthew Holcomb、Mark N. Boulous、Ryan L. Patman、Fen Wang、Michelle Tran-Dubé、Indrawan McAlpine、Keary M. Engle
DOI:10.1021/acs.joc.7b03100
日期:2018.4.6
Small molecules containing cyclopropane–heteroatom linkages are commonly needed in medicinal chemistry campaigns yet are problematic to prepare using existing methods. To address this issue, a scalable Chan–Lam cyclopropylation reaction using potassium cyclopropyl trifluoroborate has been developed. With phenol nucleophiles, the reaction effects O-cyclopropylation, whereas with 2-pyridones, 2-hydroxybenzimidazoles
Synthesis of cyclopropanes by the reaction of olefins with dialkylzinc and methylene iodide
作者:J. Furukawa、N. Kawabata、J. Nishimura
DOI:10.1016/0040-4020(68)89007-6
日期:1968.1
A novel synthetic route to cyclopropanes by the reaction of olefins with dialkylzinc and methylene iodide is described. The essential feature of the reaction is similar to that of the Simmons-Smith reaction which involves the treatment of olefins with methylene iodide and zinc-copper couple. However, the novel route gives cyclopropanes more easily and is particularly suitable for the conversion of