Synthesis of Mukonine and Seven Further 1-Oxygenated Carbazole Alkaloids

: As an intermediate in the synthesis of seven further 1-oxygenated 3-C 1 -substituted carbazole alkaloids, mukonine (1) was synthesized in 46% overall yield, starting from indole-3-car-baldehyde (12) with a Horner–Emmons reaction as the crucial step. From 1 , the other desired alkaloids were obtained in high yields. Among them, clausine E (6) and O -demethylmurrayanine (7) were synthesized for the first time.