Cyclopropyl building blocks in organic synthesis. Part 81: Striving for unusually strained oxiranes: epoxidation of spirocyclopropanated methylenecyclopropanes
作者:Daniel Frank、Sergei I Kozhushkov、Thomas Labahn、Armin de Meijere
DOI:10.1016/s0040-4020(02)00695-6
日期:2002.8
1-Oxa[3]triangulane 13, the epoxide of methylenespiropentane, is thermally stable up to 300°C, but immediately rearranges to spiro[2.3]hexan-4-one (7) in the presence of lithium iodide at ambient temperature. The permethylated bicyclopropylidene 10 is simply less reactive than the parent bicyclopropylidene (6a) towards dimethyldioxirane, but yields the isolable epoxide 11 (94%) with mCPBA. In contrast
作者:J. Chris Slootweg、Marius Schakel、Frans J. J. de Kanter、Andreas W. Ehlers、Sergei I. Kozhushkov、Armin de Meijere、Martin Lutz、Anthony L. Spek、Koop Lammertsma
DOI:10.1021/ja031648p
日期:2004.3.1
A highly strained, thermally stable (up to 150 degrees C) branched phospha[7]triangulane was synthesized from the second-generation bicyclopropylidene and transient phosphinidene [Ph-P=W(CO)5], followed by demetalation in refluxing xylene. Bulkier transient CuCl-alkene-complexed phosphinidene gave 2-phosphabicyclo-[3.2.0]hept-1(5)-ene as an additional product. The "outer sphere" spirocyclopropanes provide a stabilizing factor for both of these novel compounds.
作者:Zoellner, Stephan、Buchholz, Herwig、Boese, Roland、Gleiter, Rolf、Meijere, Armin de
DOI:——
日期:——
Kozhushkov, Sergei I.; Haumann, Thomas; Boese, Roland, Angewandte Chemie, 1993, vol. 105, # 3, p. 426 - 429
作者:Kozhushkov, Sergei I.、Haumann, Thomas、Boese, Roland、Meijere, Armin de
DOI:——
日期:——
A Third-Generation Bicyclopropylidene: Straightforward Preparation of 15,15′-Bis(hexaspiro[2.0.2.0.0.0.2.0.2.0.1.0]pentadecylidene) and aC2v-Symmetric Branched [15]Triangulane
作者:Malte von Seebach、Sergei I. Kozhushkov、Roland Boese、Jordi Benet-Buchholz、Dmitrii S. Yufit、Judith A. K. Howard、Armin de Meijere