Luche reduction of enones using cerium trichloride

10.1039/sp22 ◽  
2001 ◽  
Author(s):  
zac etheridge
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1959 ◽  
Vol 63 (7) ◽  
pp. 1110-1112 ◽  
Author(s):  
G. W. Mellors ◽  
S. Senderoff


1960 ◽  
Vol 64 (9) ◽  
pp. 1344-1344 ◽  
Author(s):  
H. R. Bronstein ◽  
A. S. Dworkin ◽  
M. A. Bredig


1974 ◽  
Vol 24 (1) ◽  
pp. 10-13 ◽  
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S. Singh ◽  
L. G. Van Uitert ◽  
J. R. Potopowicz ◽  
W. H. Grodkiewicz


1978 ◽  
Vol 9 (45) ◽  
Author(s):  
J.-L. LUCHE ◽  
L. RODRIGUEZ-HAHN ◽  
P. CRABBE
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2005 ◽  
Vol 200 (7) ◽  
pp. 2085-2091 ◽  
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J. de Damborenea


1988 ◽  
Vol 66 (11) ◽  
pp. 2805-2815 ◽  
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Peter Yates ◽  
Rupinder S. Grewal ◽  
Peter C. Hayes ◽  
Jeffery F. Sawyer

Reduction of dimethyl 3-hydroxy-4,4,8-trimethyl-6-oxo-cis-bicyclo[3.3.0]octa-2,7-diene-1,2-dicarboxylate (8) with lithium and ammonia gives dimethyl 3-hydroxy-4,4,exo-8-trimethyl-6-oxo-cis-bicyclo[3.3.0]oct-2-ene-1,2-dicarboxylate (9), which on acetylation, reduction with sodium borohydride, and methanolysis gives dimethyl 3,exo-6-dihydroxy-4,4,exo-8-trimethyl-cis-bicyclo[3.3.0]oct-2-ene-1,2-dicarboxylate (12). This on 2-decarbomethoxylation followed by treatment with lithium acetylide in the presence of cerium trichloride gives methyl 3-ethynyl-3,exo-6-dihydroxy-4,4,exo-8-trimethyl-cis-bicyclo[3.3.0]octane-1-carboxylate (21), which on hydration, diacetylation, and treatment with tri-n-butyltin hydride and azoisobutyronitrile is converted to methyl exo-6-acetoxy-3-acetyl-4,4,exo-8-trimethyl-cis-bicyclo[3.3.0]octane-1-carboxylate (31). Methanolysis of 31. tert-butyldimethylsilylation, and reaction with potassium tert-butoxide in tert-butyl alcohol gives exo-4-tert-butyldimethylsilyloxy-exo-2,6,6-trimethyl[5.3.11,5]undecane-8,10-dione (35). This on treatment with lithium aluminum hydride followed by oxidation and hydrogenation provides the corresponding 10-deoxo compound, 39. Reaction of this with methyllithium, dehydration, and desilylation with hydrogen fluoride in acetonitrile gives a mixture of (±)-α-biotol (1) and (±)-β-biotol (2); desilylation with hydrogen chloride in methanol gives solely (±)-1.





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