Picolinoxy Group, a New Leaving Group for anti S<sub>N</sub>2′ Selective Allylic Substitution with Aryl Anions Based on Grignard Reagents
作者:Yohei Kiyotsuka、Hukum P. Acharya、Yuji Katayama、Tomonori Hyodo、Yuichi Kobayashi
DOI:10.1021/ol800300x
日期:2008.5.1
The picolinoxy group was found to be an extremely powerful leavinggroup for allylic substitution with aryl nucleophiles derived from ArMgBr and CuBr*Me2S. The substitution proceeds with anti SN2' pathway and with high chirality transfer. The electron-withdrawing effect of the pyridyl group and chelation to MgBr2 are likely the origin of success. Results suggesting these effects were obtained.