Uncatalyzed Carboboration of Seven-Membered-Ring trans-Alkenes: Formation of Air-Stable Trialkylboranes
Seven-membered-ring trans-alkenes undergo rapid, uncatalyzed carboboration reactions to form trialkylboranes as single diastereomers. In contrast with other trialkylboranes, which can ignite in the presence of oxygen, these trialkylboranes are stable in air. Hindered trialkylboranes can undergo reve...
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| Veröffentlicht in: | Journal of the American Chemical Society 2017-06, Vol.139 (25), p.8404-8407 |
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| container_title | Journal of the American Chemical Society |
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| creator | Sanzone, Jillian R Hu, Chunhua T Woerpel, K. A |
| description | Seven-membered-ring trans-alkenes undergo rapid, uncatalyzed carboboration reactions to form trialkylboranes as single diastereomers. In contrast with other trialkylboranes, which can ignite in the presence of oxygen, these trialkylboranes are stable in air. Hindered trialkylboranes can undergo reverse hydroboration reactions to form allylic silanes or can be oxidized to afford highly substituted triols. This reaction sequence permits the construction of compounds with up to five consecutive stereocenters. Control experiments and computational studies support a concerted mechanism for the migratory insertion of the alkene into the carbon–boron bond, similar to the mechanism for hydroboration. |
| doi_str_mv | 10.1021/jacs.7b03986 |
| format | Article |
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| source | ACS Publications |
| title | Uncatalyzed Carboboration of Seven-Membered-Ring trans-Alkenes: Formation of Air-Stable Trialkylboranes |
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