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- W2951673503 abstract "The tandem nucleophilic addition-cyclization reaction of o-alkynylbenzaldehydes or o-alkynylacetophenones 2 with dialkyl phosphites or dialkyl phosphonothioates 1 took place very smoothly in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in THF at room temperature. In all cases, the reaction proceeded in a regioselective manner leading to the 5-exo-dig products 3 in excellent yields. The phenomenon of a 1,5-sigmatropic hydrogen shift or a 1,5-sigmatropic methyl shift was observed in this reaction depending on the different substituent groups such as R 3 in the o-alkynylbenzaldehyde or oalkynylacetophenone 2 substrates." @default.
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- W2951673503 date "2009-04-07" @default.
- W2951673503 modified "2023-09-26" @default.
- W2951673503 title "ChemInform Abstract: Efficient Syntheses of (Thio)phosphonylated Isobenzofurans by Tandem Nucleophilic Addition and Regioselective 5-exo-Dig Addition to Carbon-Carbon Triple Bond: Cooperative Effect to 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)." @default.
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- W2951673503 doi "https://doi.org/10.1002/chin.200914106" @default.
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