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Issue 4, 2017
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Selective uni- and bidirectional homologation of diborylmethane

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Abstract

Diborylmethane can be homologated uni- and bidirectionally by using enantiomerically pure lithium-stabilized carbenoids to give 1,2- and 1,3-bis(boronic esters), respectively, in good yield and with excellent levels of enantio- and diastereoselectivity. The high sensitivity of the transformation to steric hindrance enables the exclusive operation of either manifold, effected through the judicious choice of the type of carbenoid, which can be a sparteine-ligated or a diamine-free lithiated benzoate/carbamate. The scope of the 1,2-bis(boronic esters) so generated is complementary to that encompassed by the asymmetric diboration of alkenes, in that primary–secondary and primary–tertiary 1,2-bis(boronic esters) can be prepared with equally high levels of selectivity and that functional groups, such as terminal alkynes and alkenes, are tolerated. Methods for forming C2-symmetric and non-symmetrical anti and syn 1,3-bis(boronic esters) are also described and represent a powerful route towards 1,3-functionalized synthetic intermediates.

Graphical abstract: Selective uni- and bidirectional homologation of diborylmethane

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Publication details

The article was received on 05 Dec 2016, accepted on 19 Jan 2017, published on 09 Feb 2017 and first published online on 09 Feb 2017


Article type: Edge Article
DOI: 10.1039/C6SC05338F
Citation: Chem. Sci., 2017,8, 2898-2903
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    Selective uni- and bidirectional homologation of diborylmethane

    D. J. Blair, D. Tanini, J. M. Bateman, H. K. Scott, E. L. Myers and V. K. Aggarwal, Chem. Sci., 2017, 8, 2898
    DOI: 10.1039/C6SC05338F

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