We have developed a procedure for the Michael addition of 4-hydroxycoumarins to vinyl-substituted N-heterocycles, which is also suitable for thiocoumarins and quinolinones. A proposed mechanism involves nucleophilic attack at the vinyl-group of the protonated N-heterocycle.
We have developed a procedure for the Michael addition of 4-hydroxycoumarins to vinyl-substituted N-heterocycles. The chemistry is also suitable for thiocoumarins and quinolinones. A mechanism is proposed involving nucleophilic attack at the vinyl-group of the protonated N-heterocycle.
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