SYNTHESES OF POTENTIAL SPIN PROBES FOR BIOMEMBRANES - TEMPO AND PROXYL NITROXIDES OF LITHOCHOLIC ACID
The synthesis of a steroidal spin label 10 containing a tempo nitroxide group in the side chain of lithocholic acid 1 is reported. This is the first report of a tempo nitroxide in d steroidal side chain. The methodology involved d Wittig condensation between the steroidal phosphonium ylide 7 and tem...
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Published in | Tetrahedron Vol. 48; no. 45; pp. 9939 - 9950 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
OXFORD
Elsevier
1992
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Subjects | |
Online Access | Get more information |
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Summary: | The synthesis of a steroidal spin label 10 containing a tempo nitroxide group in the side chain of lithocholic acid 1 is reported. This is the first report of a tempo nitroxide in d steroidal side chain. The methodology involved d Wittig condensation between the steroidal phosphonium ylide 7 and tempone 9. The synthesis Of d proxyl nitroxide 16 with the proxyl group in the side chain of 1 is also described. A mild oxidation of 16 to the corresponding 3-keto spin label 17 in high yield is also achieved. |
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ISSN: | 0040-4020 |
DOI: | 10.1016/S0040-4020(01)92284-7 |