Tetrahedron Letters p. 8313 - 8316 (1993)
Update date:2022-09-26
Topics:
Ogura
Kayano
Fujino
Sumitani
Fujita
5-Substituted 7-methylthio-7-(p-tolylsulfonyl)-6-heptenyl radicals (1) and their 4-oxa derivatives cyclized in 6-exo manner with extremely high 1,2-asymmetric induction leading to trans ring-closure. Transition states for the ring closure are discussed by the experimental results and MO calculations.
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