Synthesis of chiral tricyclo[3.2.1.02,7]octanes by an efficient 3-exo-trig radical cyclisation reaction 1
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 2,p. 177-182
- https://doi.org/10.1039/a601315e
Abstract
Synthesis of chiral tricyclo[3.2.1.02,7]octanes by efficient and exclusive 3-exo-trig radical cyclisation of either a bicyclo[3.2.1]oct-6-en-2-yl radical or a bicyclo[2.2.2]oct-5-en-2-yl radical is described. Reaction of the methoxy enones 7a–c with boron tribromide at low temperature furnishes the bicyclo[3.2.1]octenyl bromides 9a–c and 10a–c along with varying amounts of 8a–c, whereas the methoxy enone 7d provides the unrearranged bicyclo[2.2.2]octenyl bromide 8d. Treatment of the homoallyl bromides 9a–c and 10a–c and 8d with tributyltin hydride and AIBN generates, exclusively, the tricyclic ketones 15a–d.Keywords
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