Oxidation of 2-Substituted Cycloalkanones with Cerium(IV) Sulfate Tetrahydrate in Alcohols and Acetic Acid
作者:Liangyou He、C. Akira Horiuchi
DOI:10.1246/bcsj.72.2515
日期:1999.11
The reaction of 2-substituted cycloalkanones with cerium(IV) sulfate tetrahydrate (CS) in alcohols and acetic acid gave the corresponding alkyl esters of oxo acids (80—96%) and oxo acids (78—96%), respectively, by oxidative cleavage of the C(R)–C=O bond. In the case of 2-iodocycloalkanones in methanol, the dimethyl ester was obtained in good yield. A treatment of 5α-cholestan-3-one with CS in methanol
Masters, John J.; Jung, David K.; Danishefsky, Samuel J., Angewandte Chemie, 1995, vol. 107, # 4, p. 495 - 498
作者:Masters, John J.、Jung, David K.、Danishefsky, Samuel J.、Snyder, Lawrence B.、Park, Tae Kyo、et al.
DOI:——
日期:——
Photo-Cleavage of Carbon-Carbon Bond of<b><i>α</i></b>-Iodocycloalkanones Giving<b><i>ω</i></b>,<b><i>ω</i></b>-Dialkoxyalkanoic Ester in Alcohol
作者:Shun-Jun Ji、C. Akira Horiuchi
DOI:10.1246/bcsj.73.1645
日期:2000.7
The irradiation at λ > 300 nm of α-iodocycloalkanones with a high-pressure mercury lamp in alcohols containing a small amount of water afforded the corresponding ω,ω-dialkoxyalkanoic ester (65—88%) by photochemical cleavage of the C(I)-C=O bond at room temperature. In the case of a commercial fluorescent lamp as the irradiating light source, photochemical ring-opening products were also obtained. The irradiation of 2α-iodo-5α- and 4β-iodo-5β-cholestan-3-ones in methanol gave methyl 2,2-dimethoxy-2,3-seco-5α-cholestan-3-oate and methyl 4,4-dimethoxy-3,4-seco-5β-cholestan-3-oate in 78 and 62% yields, respectively. The photochemical behavior of the cleavage reaction of α-iodocycloalkanones is also discussed on the basis of 2-hydroxycycloalkanone as an intermediate.