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Syntheses of conduritol A, E and F derivatives are described using galactitol, d-mannitol and d-glucitol, respectively, as the starting materials. The key steps of this approach comprise a Tebbe olefination reaction for the preparation of dienes 15, 21 and 27 followed by ring closing metathesis (RCM) for the formation of the polyhydroxylated cyclohexene rings of the targets. A comparative study shows...
The preparation of aminomethyl substituted silacyclohexane derivatives starting from divinylsilanes and secondary amines is achieved in a selective one-pot tandem hydroformylation/condensation sequence starting with a double olefin carbonylation and proceeding with an enamine generation followed by an aldol condensation step. Final hydrogenation leads to the silacycle in medium up to quantitative...
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