Carbocation-Mediated Rearrangements Within [n.m.1]Propellane Frameworks
1991; CSIRO Publishing; Volume: 44; Issue: 4 Linguagem: Inglês
10.1071/ch9910593
ISSN1445-0038
AutoresMartin G. Banwell, JH Ryan, David A. Winkler,
Tópico(s)Organometallic Complex Synthesis and Catalysis
ResumoMild thermolysis of the tetracyclic mesylate (6) in the presence of traces of mineral acid afforded a mixture of the rearrangement products (21) and (22) as well the σ-anti- bishomotetralin (20). On treatment with methanesulfonic acid in dichloromethane, compound (20) gives rise to the [5.4.1] propellene (21) which, on prolonged exposure to these reaction conditions, isomerizes to the mesyloxymethyl compound (22). Under the same conditions, the σ-anti- bishomoindan (4) is converted into the [5.3.1] propellene (3) which, in turn, slowly rearranges to the [4.3.1] propellene (23). A mechanistic rationalization of these observations is advanced which also accounts for the formation of the novel by-product (16) observed during Simmons-Smith cyclopropanation of allylic alcohol (15a).
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