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- W2120147400 abstract "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 o ‐alkynylacetophenone 2 substrates." @default.
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- W2120147400 date "2008-11-17" @default.
- W2120147400 modified "2023-10-18" @default.
- W2120147400 title "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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- W2120147400 doi "https://doi.org/10.1002/adsc.200800484" @default.
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