Hydrogen iodide → HCID 15506133, compound

Participants

Reaction Steps

Simple unit processes allow the conversion of several of the abovementioned X or X1 substituents, or others known in the art, to 5-X- or 5-X1 -adamantane-2-ones where X or X1 may be trialkylsilyloxy, iodo or cyano groups. These moieties are stable under the mild conditions used in step 4 of the foregoing reaction sequence. For example, when 5-hydroxyadamantan-2-one is refluxed for 7 hours with 57% hydriodic acid, 5-iodoadamantan-2-one (m.p. 73°-76° C.) is obtained. 5-Carboxyadamantan-2-one, prepared as described in Lantvoev, J. Obshch. Khim., 12, 2361 (1976) or Le Noble, et al., J. Org. Chem., 48, 1101 (1983), after saponification of the methyl ester, can be converted to 5-cyanoadamantan-2-one by the three step procedure of Tabushi, et al., J. Org, Chem., 38, 3447 (1973), used for access to the isomeric 1-cyanoadamantan-2-one through the intermediacy of a keto amide. 5-Trimethylsilyloxyadamantan-2-one (m.p. 34°-38° C.), useful as a protected version of 5-hydroxyadamantan-2-one, allows the use of only one equivalent of base in step 4 of the foregoing reaction sequence to prepare the corresponding enol ether, which can then be desilylated using standard techniques.

Provenance & Evidence