Preparation and Reactions of Functionalized Alkenyl Boranes

3 Preparation and Reactions of Functionalized Alkenyl Boranes 79 H2O2 (30 %) (1 equiv.) 

Synthesis of Alkenyl Boronic Acids by Transmetallation of Alkenyl Crignard Reagents with Boronate Esters 

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Functionalized alkenyl diamino- and dialkoxyboranes have been produced regio-and stereoselectively through addition of carbon- or heteroatomgenerated from bromotrichloromethane, thiols, phosphines and tributyltin hydride) to ethynylbis(diisopropylamino)boranes. The synthetic utility of these reactions was illustrated by the preparation of stereodefmed (Z)- or ( )-alkenylboronic esters via palladium-catalyzed crossStille reaction and a Suzuki coupling under basic conditions can be further conducted (Scheme 9.14) [33]. 

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