Synthesis 2012; 44(13): 2091-2101
DOI: 10.1055/s-0031-1291011
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Spiro[2.6]nonadienones and Spiro[3.6]decadienones by the Reaction of Cyclopropyl- and Cyclobutylmagnesium Carbenoids with Lithium Phenolates and Naphtholates

Tsuyoshi Satoh*
Graduate School of Chemical Sciences and Technology, Tokyo University of Science, Ichigaya-funagawara-machi 12, Shinjuku-ku, Tokyo 162-0826, Japan, Fax: +81(3)52614631   Email: tsatoh@rs.kagu.tus.ac.jp
,
Tsutomu Kimura
Graduate School of Chemical Sciences and Technology, Tokyo University of Science, Ichigaya-funagawara-machi 12, Shinjuku-ku, Tokyo 162-0826, Japan, Fax: +81(3)52614631   Email: tsatoh@rs.kagu.tus.ac.jp
,
Yuki Sasaki
Graduate School of Chemical Sciences and Technology, Tokyo University of Science, Ichigaya-funagawara-machi 12, Shinjuku-ku, Tokyo 162-0826, Japan, Fax: +81(3)52614631   Email: tsatoh@rs.kagu.tus.ac.jp
,
Shinobu Nagamoto
Graduate School of Chemical Sciences and Technology, Tokyo University of Science, Ichigaya-funagawara-machi 12, Shinjuku-ku, Tokyo 162-0826, Japan, Fax: +81(3)52614631   Email: tsatoh@rs.kagu.tus.ac.jp
› Author Affiliations
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Publication History

Received: 08 March 2012

Accepted after revision: 12 April 2012

Publication Date:
14 May 2012 (online)


Abstract

Treatment of 1-chlorocyclopropyl p-tolyl sulfoxides and 1-chlorocyclobutyl p-tolyl sulfoxides with a Grignard reagent at low temperature afforded cyclopropylmagnesium carbenoids and cyclobutylmagnesium carbenoids, respectively, via a sulfoxide–magnesium exchange reaction. The reaction of these magnesium carbenoids with lithium phenolates afforded spiro[2.6]nona-6,8-dien-5-ones and spiro[3.6]deca-7,9-dien-6-ones, respectively; however, the yields were rather low. Reaction of the cyclopropylmagnesium carbenoids with lithium 1-naphtholates gave spiro[2.6]nona-5,7-dien-4-ones in moderate to good yields; however, reaction of the cyclobutylmagnesium carbenoids with lithium 1-naphtholates did not give the desired products. Reaction of the cyclopropyl- and cyclobutylmagnesium carbenoids with lithium 2-naphtholates gave spiro[2.6]nona-5,7-dien-4-ones and spiro[3.6]deca-7,9-dien-6-ones, respectively, in moderate to good yields. These unprecedented reactions provide a procedure for the synthesis of spiro[2.6]nona-5,7-dien-4-ones and spiro[3.6]deca-7,9-dien-6-ones from 1-naphthols and 2-naphthols with a one-carbon ring expansion of the phenol ring.

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