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 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.
Convenient modification of the Leimgruber-Batcho indole synthesis: reduction of 2-nitro-β-pyrrolidinostyrenes by the FeCl3–activated carbon–N2H4∙H2O system
作者:I. V. Taydakov、T. Ya. Dutova、E. N. Sidorenko、S. S. Krasnoselsky
DOI:10.1007/s10593-011-0776-2
日期:2011.7
A new catalytic system containing ferric chloride, activated carbon, and hydrazine has been proposed for the reductive cyclization of beta-dialkylamino-2-nitrostyrenes to give the corresponding indoles (Leimgruber-Batcho synthesis). Various substituted indoles may be obtained in high yield under these conditions.