Stereocontrolled syntheses for the six diastereomeric 1,2-dihydroxy-4,5-diaminocyclohexanes: PtII complexes and P-388 antitumor properties
作者:Donald T. Witiak、David P. Rotella、Joyce A. Filippi、Judith Gallucci
DOI:10.1021/jm00391a011
日期:1987.8
were liberated upon catalytic (H2, Pd/C) hydrogenation. Catalytic osmylation of 9 afforded a mixture of diastereomeric diols 13 and 14, which served as precursors to cis-anti-cis CDD 3b and cis-syn-cis CDD 3a, respectively, whereas osmylation of 11 yielded the expected single product 12, the precursor to cis-anti-trans CDD 3d. Epoxidation of olefins 9 and 11 afforded oxiranes 15 and 17, respectively,
The intramolecular cooperative reactions of 1,2-bis(diazoketone)s initiated by the Wolff rearrangement of alpha-diazoketones have been investigated. Under thermal conditions, 1,2-bis(diazoketone)s are efficiently transformed into 2-cyclopenten-1-one derivatives with complete stereospecificity. Thus, a most extraordinary result is reported, that trans-hydro-2-inden-1-ones (1-3) were synthesized for the first time from trans-1,2-bis(diazoketone)s (5, 11, and 12), respectively. The unprecedented trans-hydroindenone structure was confirmed by X-ray analysis of 3 as well as H-1 NMR analysis and was supported by ab initio molecular orbital calculations. The same reactions were also carried out under photochemical conditions and were applied to 1,3-bis(diazoketone)s, giving 2-cyclohexen-1-one derivatives.
Directive effect of a carboxylate group in the hydroboration of cyclohexenes
作者:Joseph Klein、E. Dunkelblum、D. Avrahami
DOI:10.1021/jo01279a018
日期:1967.4
Korolew; Mur, Zhurnal Obshchei Khimii, 1948, vol. 18, p. 1977,1986