Studies on the Dehydrogenation of 9-Oxygenated-eudesma-4-en-3-ones with DDQ

References and Notes

• Van Beek , T. A. and De Grot , A. 1986 . Recl. Trav. Chim. Pays-Bas , 105 : 513
   Google Scholar
• Ando , M. , Isogai , K. , Azami , H. , Hirata , N. and Yanagi , Y. 1991 . J. Nat. Prod. , 54 : 1017
   PubMed Web of Science ®Google Scholar
• Walker , D. and Hiebert , J. D. 1969 . Chem. Rev. , 67 : 153
   Google Scholar
• Li , Y. L. , Chen , X. , Shao , S. C. and Li , T. S. 1993 . Indian J. Chem. , 32B : 365
   Google Scholar
• Huffman , J. W. and Hillenbrand , G. F. 1981 . Tetrahedron , 37 ( suppl. 9 ) : 269
   Web of Science ®Google Scholar
• 9- Carbonyl group of compound 1a, 1b, 2a and 2b was reduced stereospecifically and the 1H NMR spectrum of compound 4a, 4b, 5a and 5b indicated that 9-acetoxy is cis to 10-methyl, based on the observations that 9-proton appeared as double doublet (J1=10–12 Hz, J2=4–5 Hz) at δ4. 6–-4. 8 ppm in deuteriochloroform (see Experimental Section).
   Google Scholar
• Piers , E. and Cheng , K. F. 1967 . Can. J. Chem. , 45 : 1591
   Google Scholar