Here, we report a highly effective and chemoselective method of preparing substituted indoles from (E)-2-nitropyrrolidinostyrenes via hydrogenation in the presence of a rhodium catalyst doped by additives such as Ni(NO3)2·6H2O, Fe(OAc)2 or Co(acac)3. These hydrogenation conditions may also be applied to other substrates. Aromatic nitro compounds and olefins can be selectively reduced in the presence
PROCESS FOR PRODUCING INDOLOPYRROLOCARBAZOLE DERIVATIVE
申请人:BANYU PHARMACEUTICAL CO., LTD.
公开号:EP1541582A1
公开(公告)日:2005-06-15
The present invention provides a process for industrially advantageously producing a compound represented by the formula (I):
or a pharmaceutically acceptable salt thereof, which is useful as an anticancer agent, and also provides a catalyst used for hydrogenation reaction in the process.
Process for producing indolopyrrolocarbazole derivative
申请人:Akao Atsushi
公开号:US20050176968A1
公开(公告)日:2005-08-11
The present invention provides a process for industrially advantageously producing a compound represented by the formula (I):
or a pharmaceutically acceptable salt thereof, which is useful as an anticancer agent, and also provides a catalyst used for hydrogenation reaction in the process.
Process for the preparation of 5,6-diacetoxyindole
申请人:Bristol-Myers Squibb Company
公开号:EP0598383A1
公开(公告)日:1994-05-25
An indole of the formula
wherein R₅ and R₆ are acetoxy or hydrogen, at least one of R₅ and R₆ being acetoxy, is prepared, in good yield, in a one pot synthesis, without extraction, recrystallization or isolation of intermediate reaction product; A compound of the formula
wherein R₁ and R₂ are benzyloxy or hydrogen, provided that at least one of R₁ and R₂ is benzyloxy, is subjected to reductive cyclization followed by acetylation of the resultant reaction product.
Hydrogenation of (E)-2-nitropyrrolidinostyrene in the presence of the doped rhodium catalyst is safe, scalable, and highly effective for the preparation of 6-benzyloxyindole. Reaction kinetics with/without additives also were examined using in situ IR for the first time. Results showed that the additives decelerate the hydrogenolysis of benzyl ethers, while simultaneously accelerating the de-oxygenation of N-oxy-intermediates.