Di(isopropylprenyl)borane: A New Hydroboration Reagent for the Synthesis of Alkyl and Alkenyl Boronic Acids
作者:Alexey V. Kalinin、Stefan Scherer、Victor Snieckus
DOI:10.1002/anie.200351312
日期:2003.7.28
Process for preparing bisallylboranes and nonaromatic boronic acids
申请人:Clariant GmbH
公开号:US20030096995A1
公开(公告)日:2003-05-22
A process for preparing bisallylboranes of the formula (I) by reacting a diene with sodium borohydride in the presence of an oxidant
1
in an inert solvent, with the borane generated in situ reacting selectively with the diene to form the bis(allyl)borane of the formula (I) and the substituents R
1
to R
6
having the following meanings:
R
1
-R
6
are H, aryl or substituted or unsubstituted C
1
-C
4
-alkyl or two radicals R may be closed to form a cyclic system.
As oxidant, it is possible to use, for example, alkyl halides or dialkyl sulfates. In a particularly preferred embodiment, the diene used is 2,5-dimethylhexa-2,4-diene (R
1
, R
2
, R
5
, R
6
=methyl, R
3
, R
4
=H).