Neplanocin A derivatives

摘要

Neplanocin A derivatives of the formula <IMAGE> wherein R1 and R2 are hydrogen or benzoyl, R3 is hydrogen or OR8, R5 is hydrogen or acetyl, R6 is hydrogen, acetyl or benzoyl, when R3 is hydrogen, R4 is hydrogen or halogen, hydroxy, acetoxy, acetylthio, amino or azide, and when R3 is OR8, R4 is hydrogen, R8 is hydrogen or acetyl, or R8 and R5 together form benzylidene, and at least one of R8, R5 and R6 is other than hydrogen. The compounds of the present invention have inhibitory action for the growth of L 5178 Y cells and have the same or superior activity as neplanocin A, and hence are useful as antitumor agents.