Application of the Oxa-di-π-methane Photoisomerization in the Rearrangement of Carbocycles Possessing Bridgehead Unsaturation. -The bridged compound (I) is found to undergo oxa-di-π-methane photoisomerization. However, reductive opening of the cyclopropane unit of the intermediate (II) does not yie
Application of the oxa-di-π-methane photoisomerization in the rearrangement of carbocycles possessing bridgehead unsaturation
✍ Scribed by R. Michael Corbett; Chee-Seng Lee; Michelle M. Sulikowski; Joseph Reibenspies; Gary A. Sulikowski
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 596 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0040-4020
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✦ Synopsis
Studies directed toward an application of the oxa-di-pi-methane (ODPM) photoisomerization to convert a bicyclol4.4.1]undecene (1) to a bicyclo15.3.1]undecene (3) are described, This transformation, which is equivalent to a 1,2-acyl shift, could find utility in the synthesis of bioactive natural products possessing bridgehead unsaturation.
📜 SIMILAR VOLUMES
Alihough preview stu&s have shown that acyclic j3.r\_unsaturated oximea and oxime ethers do not undergo the aza-dl-mmethane {ADPM) rmrrangewmt. the Z-nu~l~,4dipAm~-2-~nylb~-3-~1 oxiww Sm. its wwhyl ether 51 and the 2,2.4,4-tetraphenylbnt-3-enal oxime I4 give the correapondhg cydopropyl derbatives &,
## Abstract The irradiation of 17β‐acetoxy‐4‐oxa‐1,5‐androstadien‐3‐one (**12**) yielded the two stereoisomeric spiro‐lactones **13** and **14**, which result from a di‐π‐methane photorearrangement. A third product, the oxa‐anthrasteroid **15**, was also isolated (__Scheme 3__).