Solid base fluorapatite was found to catalyze the Michael addition of indole/pyrrole to nitroalkenes efficiently under solventless condition, affording the products in good to excellent yields. The Michael addition occurred at the 3‐position of indole exclusively with an exception of 3‐methylindole. The synthetic fluorapatite could be recovered and reused easily without obvious loss in activity.
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Zhang et al. (2009) studied this question.
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