To provide a compound which exhibits excellent anti-tumor activity and excellent oral absorption and which is a useful anti-tumor drug.
The invention provides a 3′-ethynylcytidine derivative represented by formula (1):
(wherein X represents a (substituted) alkylcarbonyl group, a (substituted) alkoxycarbonyl group, or a hydrogen atom; one of Y and Z represents a hydrogen atom or a group represented by (R
1
)(R
2
)(R
3
)Si— and the other represents a group represented by (R
4
)(R
5
)(R
6
)Si—; and R
1
, R
2
, R
3
, R
4
, R
5
, and R
6
each represent a (substituted) alkyl group, a (substituted) cyclic alkyl group, or a (substituted) aryl group) or a salt thereof.
                            提供一种表现出优异的抗肿瘤活性和口服吸收性的化合物,该化合物是一种有用的
抗肿瘤药物。本发明提供一种由式(1)表示的3'-
乙炔基胞苷衍
生物:(其中X表示(取代)烷基羰基基团,(取代)烷氧羰基基团或氢原子;Y和Z中的一个表示氢原子或由(R1)(R2)(R3)Si-表示的基团,另一个表示由(R4)(R5)(R6)Si-表示的基团;而R1,R2,R3,R4,R5和R6各自表示(取代)烷基,(取代)环烷基或(取代)芳基)。或其盐。