Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Andreas Kanschik"'
Publikováno v:
Tetrahedron. 60:1205-1213
A new approach to helical primary structures of four-membered rings uses a cycloaddition of a trimethylenketeniminium salt to suitable tailored methylenecyclobutanes to assemble the desired carbon framework. The results are short and effective synthe
Publikováno v:
Tetrahedron. 50:10879-10892
The dispiranes 10–12 have been synthesized and rearranged by treatment with acids. With 10, an initial C3-C4 ring enlargement leads to [3.3.3]propellane 21, with 11, an initial C4-C3 ring contraction leads to pentalene 37, and with 12, an initial C
Publikováno v:
Tetrahedron Letters. 26:5277-5280
The functionalized dispiro[3.0.3.3]undecanes 6 and 7 undergo cascade rearrangements to yield the [3.3.3]propellanes 15 and 11, respectively. The formation of 15 proceeds via the bicyclic enone 16.
Publikováno v:
Tetrahedron Letters. 27:3603-3606
The functionalized dispiro[2.1.3.3]undecanes 9 and 8 undergo cascade rearrangements to yield the bi- and tricyclic systems 10 , 11 , 12 and 3 , respectively. The rearrangements proceed via an initial enlargement of the four-membered ring.
Publikováno v:
Tetrahedron Letters. 29:5525-5528
Dispiro[3.0.4.2] undecane 1 has been synthesized and rearranged to ( ± )modhephene 2 and triquinane 3 under kinetic control, and to ( ± )isocomene 4 and triquinane 5 under thermodynamic control. Molecular mechanics calculations (MM2) support the me
Publikováno v:
Strain and Its Implications in Organic Chemistry ISBN: 9789401069076
Based on model studies with dispiroundecane 9, dispiroundecane 1 has been synthesized and rearranged to both (±)modhephene 6 and (±)isocomene 7.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf5a60336df8b497160da687d236ada0
https://doi.org/10.1007/978-94-009-0929-8_27
https://doi.org/10.1007/978-94-009-0929-8_27
Publikováno v:
Tetrahedron Letters. 29:1263-1264
The dispiro [3.0.4.2] undecanes 2 and 6 undergo cascade rearrangements yielding the [3.3.3]propellanes 3 and 7 , respectively. The rearrangement of 6 proceeds regiospecifically and renders 9 a promising candidate for a direct conversion to (±)modhep