| 摘要 |
Disclosed are chroman derivatives of formula (I) wherein R1 stands for acyl with 1-6 C-atoms, -CO-R5 or an amino protective group; R2 stands for H or alkyl with 1-6 C-atoms; R3, R4 independently from one another stand for H, alkyl with 1-6 C-atoms, CN, Hal or COOR2; R5 stands for phenyl which is unsubstituted or has been substituted once or twice by alkyl with 1-6 C-atom s, OR2 or Hal; X stands for H, H or O; Hal stands for F, Cl, Br or I. Said derivatives and their salts can be used as intermediate products in the synthesis of medicaments.
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