Chiral organochlorosilanes derived from terpenes: diastereoselective hydrosilylation of methylene bicyclo[2.2.1]heptanes with HSiMenCln-2 (n=0-2)
Beckmann, Jens, Dakternieks, Dainis, Duthie, Andrew, Floate, Susan L., Foitzik, Richard C. and Schiesser, Carl H. 2004, Chiral organochlorosilanes derived from terpenes: diastereoselective hydrosilylation of methylene bicyclo[2.2.1]heptanes with HSiMenCln-2 (n=0-2), Journal of organometallic chemistry, vol. 689, no. 5, pp. 909-916, doi: 10.1016/j.jorganchem.2003.12.021.
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Title
Chiral organochlorosilanes derived from terpenes: diastereoselective hydrosilylation of methylene bicyclo[2.2.1]heptanes with HSiMenCln-2 (n=0-2)
Formatted title
Chiral organochlorosilanes derived from terpenes: diastereoselective hydrosilylation of methylene bicyclo[2.2.1]heptanes with HSiMenCln-2 (n=0-2)
The H2PtCl6 catalysed hydrosilylation of the terpenes (+)-α-fenchene (XI), (−)-2-methylene bornane (XII), (+)-camphene (XIII) and (−)-3-methylene fenchane (XIV) using HSiMe2Cl or HSiMeCl2 proceeds with high regioselectively and in some cases, with high diastereoselectivity. KF-assisted oxidation of the hydrosilylation products gives predominately endo-terpene alcohols. The alcohols have inverted endo/exo ratios to those formed by oxidative hydroboration. Reaction of XIV with HSiMe2Cl or HSiMeCl2 is accompanied by a clean rearrangement of the isocamphane skeleton into (+)-2-methylene bornane (XII) prior to hydrosilylation.
The hydrosilylation of α-fenchene, 2-methylene bornane, camphene and 3-methylene fenchane with chlorosilanes HSiMenCln − 2 (n=0–2) occurred with varying degrees of diastereoselectivity providing anti-Markovnikov product mixtures, in which the endo-isomers dominate over the exo-isomers. These mixtures were oxidized to give the corresponding terpene alcohols. 3-Methylene fenchane undergoes a rearrangement into 2-methylene bornane prior to hydrosilylation.
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