The regio- and stereo-selectivities in the [2 + 2] photocycloaddition of a series of 1-benzoylindoles with vinyl acetate and methyl acrylate have been investigated. With some exceptions, the 1 -benzoylindoles gave exclusively or predominantly the corresponding 1-acetoxy-3-benzoyl and 3-benzoyl-1-methoxycarbonyl-1,2,2a,7b-tetrahydro-3H-cyclobut[b]indoles as mixtures of stereoisomers.
M. Ikeda, K. Ohno, S. Mohri, M. Takahashi and Y. Tamura, J. Chem. Soc., Perkin Trans. 1, 1984, 405 DOI: 10.1039/P19840000405
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