NOVEL PYRIDONE CARBOXYLIC ACID DERIVATIVE OR SALT THEREOF
申请人:WAKUNAGA PHARMACEUTICAL CO., LTD.
公开号:US20200062752A1
公开(公告)日:2020-02-27
It is intended to provide a novel compound having high antitumor activity and low toxicity to normal cells. The present invention provides a pyridone carboxylic acid derivative represented by the following formula (1) or a salt thereof wherein R
1
represents a hydrogen atom, a halogen atom or the like; R
2
represents a hydrogen atom, a halogen atom or the like; R
3
to R
6
each represent a hydrogen atom or the like; R
7
represents a hydrogen atom or the like; R
8
represents a hydrogen atom, a halogen atom, the following formula (a) (wherein R
a1
and R
a2
each represent a hydrogen atom, a hydroxy group, an optionally substituted lower alkyl group or the like) or the like, or R
7
and R
8
together represent —N—OR
10
(wherein R
10
represents a hydrogen atom, an optionally substituted lower alkyl group, or an aralkyl group), or R
7
and R
8
form an optionally substituted 4- to 6-membered saturated hetero ring together with the adjacent carbon atom, or the like; R
9
represents a hydrogen atom or the like; X represents a nitrogen atom or the like; and Y represents a nitrogen atom or the like.
2,2-Bis(ethoxycarbonyl)vinyl (BECV) as a Versatile Amine Protecting Group for Selective Functional-Group Transformations
作者:Andivelu Ilangovan、Rajendran Ganesh Kumar
DOI:10.1002/chem.200902054
日期:——
used for the selective protection of amines at room temperature in the presence of potentially interfering functional groups such as OH, SH, COOH as well as other NH2 groups. Several functional group transformations such as esterification, O‐alkylation, O‐acylation, N‐alkylation, N‐acylation, S‐alkylation can selectively be carried out in the presence of the BECV group. The selective deprotection of