Synfacts 2005(0): 0070-0070  
DOI: 10.1055/s-2005-869923
Metal-Mediated Synthesis
© Georg Thieme Verlag Stuttgart · New York

Hydroboration with Pyridine Borane

Rezensent(en): Paul Knochel, Andrei Gavryushin
J. M. Clay, E. Vedejs*
University of Michigan, USA
Hydroboration with Pyridine Borane at Room Temperature
J. Am. Chem. Soc.  2005,  127:  5766-5767  
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Publikationsverlauf

Publikationsdatum:
20. Juli 2005 (online)


Significance

A stable available pyridine-borane complex after the reaction with iodine gives a selective hydroborating agent, active at room temperature. Acetylenes can be transformed into ketones after oxidation. Mono-, di- and trisubstitut­-ed alkenes can be readily hydroborated leading to mono-adducts at room temperature. Functional groups like esters, amines and amides are tolerated.

Comment

Despite the numerous existing hydroborating agents, developed to date, there is still the lack of a cheap, selective, robust and stable reagent. Pyridine-borane complex is a stable and not air-sensitive liquid. On the reaction with iodine, it is transformed into a strong but selective hydroborating agent, that reacts equally well with alkynes and alkenes, tolerating reducible functional groups. The procedure is very simple and practical.