This first study of the sila-Pummerer rearrangement in a cyclopropane system reveals that several 1 -trimethylsiloxy-7 -(phenylthio)cyclopropanes can be prepared stereoselectively through putative sulfur-stabilized carbocationic intermediates.
1-Methoxy-1-(phenylthio)cyclopropanes from olefins via the Pummerer rearrangement
β Scribed by M. Bhupathy; Theodore Cohen
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- French
- Weight
- 258 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The Pummerer rearrangements of cyclopropyl(methoxy)phenylsulfonium salts proceed via sulfur-stabilized carbocations to yield the title compounds. The sulfonium salts were prepared in high yields from olefins via carbene addition, oxidation, and methylation.
π SIMILAR VOLUMES
a-Lithiated 1-[(2-methoxyethoxy)methoxy]-2-(phenylsylfinyl)cyclopropane reacted smoothly with alkylating agents to afford the corresponding a-alkylated cyclopropylsulfoxides, which underwent the Pummerer-type reaction mediated ring-opening at low temperature (-78Β°C) by employing TFAA/Pr i 2 NEt/CH 2
Z)-2-Methoxy-l-phenylthio-l.,3-butadienes which are substituted with an alkyl group at the 4-position are not preparable by copper(I)-induced elimination of thiophenol from 4-alkyl-Z-methoxy-l,l-bis(phenylthio)-3-alkenes; a Z-step stereospecific synthesis of one such diene ( ) is described. Recent