Mechanistic Insight into Additions of Allylic Grignard Reagents to Carbonyl Compounds
作者:Nicole D. Bartolo、K. A. Woerpel
DOI:10.1021/acs.joc.8b01430
日期:2018.9.7
Allylic Grignard reagents exhibit high reactivity and low selectivity in additions to carbonyl compounds. Additions of allylic Grignard reagents to carbonyl compounds were investigated using prenylmagnesium chloride as a mechanistic probe. When the carbonyl group is relatively unhindered, the addition proceeds through a six-membered transition state with allylic transposition. This process generally
除羰基化合物外,烯丙基格氏试剂还显示出高反应性和低选择性。使用异戊烯基氯化镁作为机械探针研究了烯丙基格利雅试剂向羰基化合物的添加。当羰基相对不受阻碍时,加成通过具有烯丙基转座的六元过渡态进行。因为反应速率接近扩散极限,所以该过程通常没有非对映选择性地发生。但是,在酮受阻的情况下,该途径是不利的,并且添加过程会通过类似于其他格氏试剂的过渡状态进行。