The trimethylsilyl trifluoromethanesulfonate accelerated Diels-Alder reaction between 1,3-dimethyl-4-(phenylsulfonyl)-4H-furo[3,4-b]indole (3) and 5,6-dihydropyridones (10) shows high regioselectivity, yielding carbazole 11 upon hydrolytic workup. Carbazole 11b has been successfully converted to the pyridocarbazole alkaloid ellipticine (1).
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Davis et al. (1990) studied this question.
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