Diastereo- and Regioselective Synthesis of Diquinanes and Related Systems from Tricyclo[3.3.0.02,4]octanes by Chemical Electron Transfer (CET)
作者:Waldemar Adam、Thomas Heidenfelder、Coskun Sahin
DOI:10.1055/s-1995-4072
日期:1995.9
A new synthetic methodology for diquinanes by one-electron oxidation of tricyclo[3.3.0.02,4]octanes and subsequent stereocontrolled rearrangement is provided. The latter compounds are conveniently accessible through acid-catalyzed isopyrazole cycloaddition, followed by hydrogenation and photoextrusion of molecular nitrogen. The oxidative rearrangement of the tricyclooctanes proceeds catalytically and cleanly to afford regio- and diastereoselectively the corresponding diquinanes.
作者:Nikolai S. Zefirov、Sergei I. Kozhushkov、Tamara S. Kuznetsova、Boris A. Ershov、Stanislav I. Selivanov
DOI:10.1016/s0040-4020(01)87474-3
日期:1986.1
The mechanism of recently discovered ring-opening reactions of 1,1-diacyclopropanes with hydrazine and hydroxylaminederivatives is investigated using the 1H-NMR flow (and stopped-flow) method and transient formation of spiro-activated intermediates of type 4 and 19 is proved. The mechanistic and synthetic sequences of these findings are discussed.
Opening of the three-membered ring in 1,1-disubstituted cyclopropanes as a method for the synthesis of functional derivatives of pyrazole and isoxazole
作者:N. S. Zefirov、S. I. Kozhushkov、T. S. Kuznetsova
DOI:10.1007/bf00523078
日期:1983.6
ZEFIROV, N. S.;KOZHUSHKOV, S. I.;KUZNETSOVA, T. S., XIMIYA GETEROTSIKL. SOEDIN., 1983, N 6, 801-807
作者:ZEFIROV, N. S.、KOZHUSHKOV, S. I.、KUZNETSOVA, T. S.
DOI:——
日期:——
BECK K.; HUNIG S., CHEM. BER., 120,(1987) N 4, 477-483