DOI:
10.1055/s-00000083
Synlett
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Interestingly, 10 mol% HBArF24 ([H(OEt2)2][B(C6H3(CF3)2)4], Brookhart’s acid) as catalyst provided hydride-trapped 6 in an inferior 47% NMR yield but 45:36:19 d.r. favoring the same diastereomers as those resulting from the putative silylium ion catalysis (cf. Table 1, entry 2; see Supporting Information). This suggests that the reaction can be catalyzed by Brønsted acid and that co-catalysis could be operative via adventitious water. See: Schmidt RK. Muether K. Mueck-Lichtenfeld C. Grimme S. Oestreich M.
J. Am. Chem. Soc. 2012;
134: 4421
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