CONVERSION OF TRYPTOPHAN INTO BETA-CARBOLINE DERIVATIVES
申请人:Pirc Samo
公开号:US20110105751A1
公开(公告)日:2011-05-05
The invention belongs in the field of organic chemistry and relates to a new shortened Pictet-Spengler type reaction for preparing isomerically pure β-carboline compounds useful for the synthesis of tadalafil.
PROCESS FOR THE PREPARATION OF INTERMEDIATES OF TETRACYCLIC COMPOUNDS
申请人:Patil Dattatray B.
公开号:US20100228030A1
公开(公告)日:2010-09-09
The present invention relates to a process for the preparation of cis-intermediates of Formula II, (Formula II) wherein R1 represents hydrogen, (un)substituted alkyl, alkenyl, aryl, and X represents a leaving group, which are useful synthetic intermediates in the preparation of tetracyclic compounds having phosphodiesterase inhibitory activity.
PROCESS FOR THE PREPARATION OF AN INTERMEDIATE OF TADALAFIL
申请人:RANBAXY LABORATORIES LIMITED
公开号:US20140142309A1
公开(公告)日:2014-05-22
The present invention relates to a process for the preparation of a cis-intermediate compound of Formula II
which is a useful synthetic intermediate for the preparation of tadalafil of Formula I—a potent,
selective, and reversible inhibitor of cyclic guanosine 3′,5′-monophosphate specific phosphodiesterase type 5 enzyme having phosphodiesterase inhibitory activity.
The present invention relates to a process for the preparation of tadalafil of Formula I,
comprising reacting a D-tryptophan compound of Formula III with piperonal in sulfolane.
Process for the preparation of an intermediate of tadalafil
申请人:Patil Dattatray B.
公开号:US08445698B2
公开(公告)日:2013-05-21
The present invention relates to a process for the preparation of cis-intermediate of Formula II,
which is useful synthetic intermediates in the preparation of tadalafil.