Friedel–Crafts allylation of 2-(benzyloxy)-3,4,5-trimethoxytoluene Catalysed by a Metal Trifluoromethanesulfonic Salt: Synthesis of Coenzyme Q10

In the presence of a catalytic amount of scandium triflate, 2-benzyloxy-3,4,5-trimethoxytoluene reacted with allylic derivatives 4, giving the key intermediate 3 (R = benzyl) which was used for preparing coenzyme Q10, in moderate to high yields.

Regioselective prenylation of bromocarbazoles by palladium(0)-catalysed cross coupling – synthesis of O-methylsiamenol, O-methylmicromeline and carquinostatin A

We describe the regioselective prenylation of 3-bromo-carbazole by Pd(0)-catalysed cross coupling with a prenylstannane or a prenylboronate. The procedure is applied to the synthesis of bioactive carbazole alkaloids.

First total synthesis of the 7-oxygenated carbazole alkaloids clauszoline-K, 3-formyl-7-hydroxycarbazole, clausine M, clausine N and the anti-HIV active siamenol using a highly efficient palladium-catalyzed approach

Using a convergent palladium-catalyzed construction of the carbazole framework as the key step we have achieved a short synthesis of the 7-oxygenated carbazole alkaloids clauszoline-K, 3-formyl-7-hydroxycarbazole, clausine C (clauszoline-L), clausine M, clausine N and the anti-HIV active siamenol.

First enantioselective total synthesis of neocarazostatin B, determination of its absolute configuration and transformation into carquinostatin A

The first enantioselective total synthesis of neocarazostatin B, the determination of its absolute configuration and transformation into carquinostatin A are described.

The Friedel−Crafts Allylation of a Prenyl Group Stabilized by a Sulfone Moiety: Expeditious Syntheses of Ubiquinones and Menaquinones

An efficient synthetic method for the protected p-hydroquinone compounds 4 containing the C5 trans allylic sulfone moiety has been developed by the direct Friedel-Crafts allylation of the protected dihydroquinone 2 with 4-chloro-2-methyl-1-phenylsulfonyl-2-butene (7a) or 4-hydroxy-2-methyl-1-phenylsulfonyl-2-butene (7b). Expeditious total syntheses of coenzyme Q-10 and vitamin K2(20) have been demonstrated from these valuable key compounds 4a and 4b.