Tanabe Seiyaku Company, Limited

Kunihiko Ozaki

Kenji Tsujihara

Motoaki Ohashi

Naoyuki Harada

Koji Oda

Tetsuo Yamaguchi

Tomiki Hashiyama

Noriyuki Nakanishi

Disclosed are 13.alpha.-(3-substituted-2-hydroxypropionyloxy)baccatin compounds represented by the formula: ##STR1## wherein R.sup.1 represents a lower alkanoyl group or a protective group for hydroxy group; R.sup.2 represents a protective group for hydroxy group; R.sup.3 represents a lower alkanoyl group; R.sup.4 represents a substituted or unsubstituted benzoyl group; X represents a substituted or unsubstituted aryl group, a substituted or unsubstituted lower alkenyl group, or a substituted or unsubstituted lower alkynyl group; and A' represents a halogen atom, azido group or amino group, and processes for preparing the same.

Baccatin derivatives and processes for preparing the same

An ellipticine derivative of the formula [I]: ##STR1## wherein R is a substituted lower alkyl group, a substituted or unsubstituted lower alkoxy group or a heteromonocyclic group, or a pharmaceutically acceptable salt thereof, which show excellent antitumor activity, less side effects, less toxicity and/or high solubility in water and are useful as antitumor agent, and a process for preparing the same.

Ellipticine derivative and process for preparing the same

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Higashimurayama, Japan

Kunihiko Ozaki