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Enantioselective synthesis of (E)-?-silyl-anti-homoallylic alcohols via an enantiodivergent hydroboration-crotylboration reaction of a racemic allenylsilane.

ABSTRACT: The enantioselective hydroboration of racemic allenylsilane (±)-4 with ((d)Ipc)2BH proceeds via enantiodivergent pathways to give vinylborane 11 and crotylborane intermediate (S)-E-5. Subsequent crotylboration of aldehyde substrates with (S)-E-5 at -78 °C provides (E)-?-silyl-anti-homoallylic alcohols in 71-89% yield and with 93-96% ee.

SUBMITTER: Chen M 

PROVIDER: S-EPMC3663895 | biostudies-other | 2013 Apr

REPOSITORIES: biostudies-other

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Enantioselective synthesis of (E)-δ-silyl-anti-homoallylic alcohols via an enantiodivergent hydroboration-crotylboration reaction of a racemic allenylsilane.

Chen Ming M   Roush William R WR  

Organic letters 20130327 7

The enantioselective hydroboration of racemic allenylsilane (±)-4 with ((d)Ipc)2BH proceeds via enantiodivergent pathways to give vinylborane 11 and crotylborane intermediate (S)-E-5. Subsequent crotylboration of aldehyde substrates with (S)-E-5 at -78 °C provides (E)-δ-silyl-anti-homoallylic alcohols in 71-89% yield and with 93-96% ee. ...[more]

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