Thermal activation of γ,δ-unsaturated ketones (1, 9 and 12) in the presence of a catalytic amount of propionic acid causes a rearrangement to give new γ,δ-unsaturated ketones (2, 10 and 14)via an intramolecular ene reaction followed by a retro-ene reaction.
Srikrishna, A.; Krishnan, K.; Venkateswarlu, S., Journal of the Chemical Society. Perkin transactions I, 1995, # 16, p. 2033 - 2038
作者:Srikrishna, A.、Krishnan, K.、Venkateswarlu, S.、Kumar, P. Praveen
DOI:——
日期:——
Total synthese of (±)-cyclolaurene, (±)-epicylolaurene and (±)-β-cuparenones
作者:Adusumilli Srikrishna、Kathiresan Krishnan
DOI:10.1016/0040-4020(92)85016-8
日期:1992.1
route to (±)-β-cuparenone () are reported. Thus, orthoester Claisenrearrangement of the cinnamyl alcohol furnished the eneester . Anhydrous CuSO, catalysed intramolecular cyclopropanation of the diazoketone derived from the ene-acid , generated a diastereoisomeric mixture of cyclopropylketone . The Huang-Minlon reduction of the ketones and furnished the cyclolaurene () and epicyclolaurene (), whereas
Dynamic Kinetic Resolution of Alkenyl Cyanohydrins Derived from α,β-Unsaturated Aldehydes: Stereoselective Synthesis of <i>E</i>-Tetrasubstituted Olefins
作者:Jadab Majhi、Ben W. H. Turnbull、Ho Ryu、Jiyong Park、Mu-Hyun Baik、P. Andrew Evans
DOI:10.1021/jacs.9b04384
日期:2019.7.31
A novel dynamic kinetic resolution (DKR) of tetrasubstituted alkenyl cyanohydrins prepared from the corresponding α,β-unsaturatedaldehydes is described. The deprotonation of a geometrical mixture of tetrasubstituted alkenyl cyanohydrins with sodium diisopropylamide (NaDA) enables the equilibration of the E- and Z-olefins and the selec-tive functionalization of former to selectively afford the E-adduct