A camptothecin derivative comprising a compound of the formula \x9bI!: ##STR1## wherein R.sup.1 is a substituted or unsubstituted lower alkyl group, X.sup.1 is a group of the formula: --NHR.sup.2 (R.sup.2 is a hydrogen atom or a lower alkyl group) or a group of --OH, and Alk is a straight chain or branched chain alkylene group having optionally an oxygen atom in the chain thereof, bound to a polysaccharide having carboxyl groups via an amino acid or a peptide, or a pharmaceutically acceptable salt thereof. Said camptothecin derivatives show enhanced antitumor activities but few side effects unlike conventional anticancer agents, and hence, these compounds are extremely useful as a medicament.
S type 2-substituted hydroxy-2-indolidinylbutyric ester compounds and process for preparation thereof
申请人:TANABE SEIYAKU CO., LTD.
公开号:US20030135049A1
公开(公告)日:2003-07-17
A process for preparing S type 2-substituted hydroxy-2-indolidinylbutyric ester compound [II]:
1
wherein R
o
is residue of nitrogen-containing fused heterocyclic carboxylic acid having absolute configuration of “R” (in which the nitrogen atom is protected), R1 and R2 are lower alkyl groups, and E is ester residue, which is useful as an intermediate for preparing camptothecin derivatives having antitumor activities, which comprises 2-ethylating 2-substituted hydroxy-2-indolidinylacetic ester compound [I]:
2
wherein the symbols are as defined above.
Stype 2-substituted hydroxy-2-indolidinylbutyric ester compounds and process for preparation thereof
申请人:Tanabe Seiyaku Co., Ltd.
公开号:US20020161231A1
公开(公告)日:2002-10-31
A process for preparing S type 2-substituted hydroxy-2-indolidinylbutyric ester compound [II]:
1
wherein R
o
is residue of nitrogen-containing fused heterocyclic carboxylic acid having absolute configuration of “R” (in which the nitrogen atom is protected), R1 and R2 are lower alkyl groups, and E is ester residue, which is useful as an intermediate for preparing camptothecin derivatives having antitumor activities, which comprises 2-ethylating 2-substituted hydroxy-2-indolidinylacetic ester compound [I]:
2
wherein the symbols are as defined above.
Nitrogen-containing fused heterocyclic carboxylic acids having an absolute configuration of “R”
申请人:Tanabe Seiyaku Co., Ltd.
公开号:US07060832B2
公开(公告)日:2006-06-13
Nitrogen-containing fused heterocyclic carboxylic acid having an absolute configuration of “R” of the formula [XIX]:
wherein Y is substituted or unsubstituted arylsulfonyl group or an alkylsulfonyl group, and n is 0 or 1, or a salt thereof.
S type 2-substituted hydroxy-2-indolidinylbutyric ester compounds as intermediates for camptothecin derivatives
申请人:TANABE SEIYAKU CO., LTD.
公开号:EP0845464A2
公开(公告)日:1998-06-03
A process for preparing S type 2-substituted hydroxy-2-indolidinyl-butyric ester compound [II]:
wherein R° is residue of nitrogen-containing fused heterocyclic carboxylic acid having absolute configuration of "R"(in which the nitrogen atom is protected), R1 and R2 are lower alkyl group, and E is ester residue, which is useful as an intermediate for preparing camptothecin derivatives having antitumor activities,
comprises 2-ethylating 2-substituted hydroxy-2-indolidinylacetic ester compound [I]:
wherein the symbols are as defined above.