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DOI: 10.1055/s-0031-1289600
Convenient Synthesis of Ethenylcyclopropane and Some 2-Cyclopropylcyclopropane Derivatives [¹]
Publikationsverlauf
Publikationsdatum:
11. November 2011 (online)

Abstract
Ethenylcyclopropane (5) was prepared from cyclopropyl methyl ketone (1) in four simple, easily scalable steps (bromination, reduction to the bromohydrin, acetylation of the latter, and reductive elimination with Zn/Cu) in an overall yield of 56%. 1-Bromo-2-cyclopropylcyclopropane (7) (approximately 1:1 mixture of cis- and trans-7) was prepared from 5 via the dibromide 6, and from 7 the boronate cis/trans-8 (ratio 1:1) was obtained in 96% yield. Rhodium(II)-catalyzed cyclopropanation of 5 with ethyl diazoacetate gave ethyl 2-cyclopropylcyclopropanecarboxylate (cis/trans-9, ratio 1:1.4) in 80% yield. The latter was also prepared in 79% overall yield by sequential cyclopropanation of buta-1,3-diene with ethyl diazoacetate [under Rh2(OAc)4 catalysis] and diiodomethane/diethylzinc/trifluoroacetic acid. Curtius degradation of 2-cyclopropylcyclopropanecarboxylic acid (obtained by hydrolysis of the ester) gave 2-cyclopropylcyclopropanamine (1:1.2 mixture of cis- and trans-isomers) in 58% yield.
Key words
bromination - reduction - elimination - alkenes - cyclopropanation - small rings
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