Table 3.
Pd-catalyzed trans-cyanoboration of aryl 1,3-enynes (R2 = Ar)a
Yields of isolated isomerically pure trans product (average of 2 runs), based on 2. The diastereomeric ratio in parenthesis (trans:cis) was determined by 1H NMR of the crude material after addition of 1,8-diaminonaphthalene.
15 mol% catalyst loading, 1.2 equiv. CuCN, 1.6 equiv. BCatCl, 90 °C, 25 min.