作者:Shinsuke Nii、Jun Terao、Nobuaki Kambe
DOI:10.1021/jo0354241
日期:2004.1.1
the use of a titanocene catalyst. This reaction proceeds efficiently at 0 °C in THF in the presence of Cp2TiCl2 by the combined use of organic halides (R−X; R = alkyl, aryl and vinyl) and n-BuMgCl to afford benzyl, α-silylalkyl, or allyl Grignard reagents, which were trapped with various electrophiles. The present reaction involves (i) addition of carbon radicals toward alkenes or dienes in the carbon−carbon
通过使用钛茂催化剂,已经开发了一种用于烯烃和二烯的区域选择性碳还原的新方法。通过有机卤化物(RX ; R =烷基,芳基和乙烯基)和n- BuMgCl的组合使用,该反应在0°C的Cp 2 TiCl 2存在下于THF中有效进行,得到苄基,α-甲硅烷基烷基,或烯丙基格氏试剂,它们被各种亲电试剂捕获。本反应包括(i)在形成碳-碳键的步骤中向烯烃或二烯添加碳自由基,以及(ii)在Ti-上进行苄基-,α-甲硅烷基烷基-或烯丙基噻吩茂金属上的正金属化,并在碳-镁键形成步骤。该反应的范围和局限性也已被研究。