Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5265843 | Tetrahedron Letters | 2012 | 4 Pages |
Abstract
The reaction of syn-1,2,4-triols under sulfonylation conditions catalyzed by Bu2SnO (5 mol %) results in cyclization and the formation of 3-hydroxy tetrahydrofurans (56-85%) while the anti-1,2,4-triols react to give C1-O-sulfonyl derivatives in good yields (66-83%) and the cyclization product in poor yield (5-12%). A mechanism that justifies these observations is proposed to occur via the tosylation of the primary hydroxyl followed by an intramolecular tin acetal rearrangement to a 1,3-stannylene which then undergoes a 5-exo-tet-cyclization. The difference in rates of cyclization reactivity is due to the energetically more stable tin acetals of syn-1,3-diols compared to those of anti-1,3-diols.
Related Topics
Physical Sciences and Engineering
Chemistry
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Authors
Makhosazana P. Gamedze, Rejoice B. Maseko, Fidelis Chigondo, Comfort M. Nkambule,