Synthesis 2012(3): 372-376  
DOI: 10.1055/s-0031-1289600
PSP
© Georg Thieme Verlag Stuttgart ˙ New York

Convenient Synthesis of Ethenylcyclopropane and Some 2-Cyclopropylcyclopropane Derivatives [¹]

Valentin A. Rassadina, Viktor V. Sokolova, Alexander F. Khlebnikova, Nikolay V. Ulina, Sergei I. Kozhushkovb, Armin de Meijere*b
a Department of Chemistry, Saint Petersburg State University, Universitetskii Prospekt 26, Petrodvorets, 198504 St. Petersburg, Russian Federation
b Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
Fax: +49(551)23422; e-Mail: ameijer1@uni-goettingen.de;
Further Information

Publication History

Received 16 August 2011
Publication Date:
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.

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11

The bromo ketone 2 is extremely lachrymatory, therefore care must be taken in handling it. A one-pot reaction for the bromination and ensuing NaBH4 reduction without isolation of the bromo ketone gave only a poor yield of impure bromohydrin 3.

12

A quick search in the REAXYS data file disclosed 64 references for 2-cyclopropylcyclopropane derivatives, many of which are patents and of rather recent vintage.

15

For applications of n-Bu3SnH in reductions of dibromo-cyclopropanes, see refs. 8a,b.