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| Title: | Seven-membered cyclic transition state in the alkoxy-radical induced intramolecular hydrogen abstraction of 26-hydroxy-furostans |
Authors: | Francisco, Cosme G. CSIC; Freire, Raimundo CSIC; Hernández, Rosendo CSIC; Medina, María C.; Suárez, Ernesto CSIC ORCID | Issue Date: | 1983 | Publisher: | Elsevier | Citation: | Tetrahedron Letters 24 (42): 4621-4624 (1983) | Abstract: | The photolysis of 26-hydroxy-furostan (5) and (8) in the presence of Pb(OAc)4/I2 afforded spirostan sapogenins (4) and (7) respectively in 80% yield. This cyclization takes place by an uncommon 1,6-hydrogen shift involving a 7-membered transition state as demonstrated by using specifically deuterium labeled compounds. | Description: | 4 pages, 2 schemes.-- Available online 6 April 2001. | Publisher version (URL): | http://dx.doi.org/10.1016/S0040-4039(00)85972-9 | URI: | http://hdl.handle.net/10261/18132 | DOI: | 10.1016/S0040-4039(00)85972-9 | ISSN: | 0040-4039 |
| Appears in Collections: | (IPNA) Artículos |
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