1,1-Carboboration of 1-Alkynes: A Conceptual Alternative to the Hydroboration Reaction
摘要:
Strongly electrophilic boranes R-B(C6F5)(2) react readily with a variety of 1-alkynes by means of a 1,1-carboboration reaction to yield alkenylborane products, which can subsequently be used as reagents in metal catalyzed cross-coupling reactions.
The use of very electrophilic boranes RB(C(6)F(5))(2) widens the scope of the 1,1-carboboration reaction substantially. Simple terminal alkynes HC identical withCR undergo this reaction with the RB(C(6)F(5))(2) reagents rapidly under mild conditions to give high yields of very useful new alkenylborane products. Even internal alkynes RC identical withCR undergo 1,1-carboboration with the RB(C(6)F(5))(2)
Strongly electrophilic boranes R-B(C6F5)(2) react readily with a variety of 1-alkynes by means of a 1,1-carboboration reaction to yield alkenylborane products, which can subsequently be used as reagents in metal catalyzed cross-coupling reactions.