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W2020191972 abstract "Cyclisation of ethoxylactam 5 in formic acid at room temperature gives rise to stereospecific formation of 9. Similar reaction of the olefin 6 possessing unnatural geometry also proceeds stereospecific and in quantitative yield to the tetracyclic product 10. The acetylene 7 equally affords 11. Upon Me-substitution of the olefinic double bond the cyclisation of 8 has to be carried out in trifluoroacetic acid-dichloromethane in order to obtain a 84% yield of 12 again formed with a high degree of stereoselectivity. The results are discussed on the basis of a mechanism involving synchronous bond formation." @default.
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W2020191972 date "1978-01-01" @default.
W2020191972 modified "2023-09-27" @default.
W2020191972 title "Biomimetic heterocyclisation of aryl olefins one-step formation of two carbon-carbon bonds" @default.
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W2020191972 doi "https://doi.org/10.1016/s0040-4020(01)93600-2" @default.
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