New protocol for allylic substitution with aryl and alkenyl copper reagents derived from organolithiums
作者:Yohei Kiyotsuka、Yuichi Kobayashi
DOI:10.1016/j.tetlet.2008.10.002
日期:2008.12
Substitution of allylic picolinoates with copper reagentsderivedfrom sp2-carbon-lithiums and CuBr·Me2S was established to furnish anti SN2′ products with almost perfect regioselectivity and chirality transfer. The preparations of organolithiums such as lithium–halogen exchange and ortho lithiation were coupled to the substitution to install various sp2-carbon groups, which include Ph, 2,6-Me2C6H3
建立了由sp 2-碳锂和CuBr·Me 2 S衍生的铜试剂取代烯丙基吡啶啉酸酯,以提供具有几乎完美的区域选择性和手性转移的抗S N 2'产物。将有机锂的制备方法(例如锂-卤素交换和邻位锂化)与取代反应相结合,以安装各种sp 2-碳基团,其中包括Ph,2,6-Me 2 C 6 H 3,4 -Me-2,6- (MOMO)C 6 H 2,以及顺式和反式1-庚烯基。