Regioselectivity of 1,3-Dipolar Cycloadditions of Benzonitrile Oxide to Alkenyl Boronic Esters: An Experimental and Computational Study
作者:Jo Jeong、Kyukwan Zong、Joong Chul Choe
DOI:10.1002/jhet.2667
日期:2017.3
1,3‐Dipolar cycloaddition reactions of benzonitrileoxide to monosubstituted or 1,1‐disubstituted alkenyl boronic ester gave only 2‐isoxazolines, bearing the boronic ester group at the 5‐position of the ring. On the other hand, the cycloaddition reactions of benzonitrileoxide with trans‐1,2‐disubstituted alkenyl boronic esters produced 2‐isoxazolines, bearing the boronic ester group at the 4‐position
Migration of 1-alkenyl groups from zirconium to boron compounds
作者:Thomas E. Cole、Ramona Quintanilla、Stephan Rodewald
DOI:10.1021/om00056a062
日期:1991.10
The reaction of dicyclopentadienylzirconium alkenyl chloride with a boron chloride or bromide results in the exchange of the halogen and alkenyl group, forming the alkenylborane. We report here a systematic investigation of the transmetalation of the 1-hexenyl group from zirconium to a variety of boron compounds. This group undergoes facile migration to a variety of boron compounds, yielding structurally different types of alkenylboranes in good to high yields. These results suggest that one can combine the unique reactivity and selectivity of hydrozirconation for the preparation of alkenylboranes.