| 摘要 |
<p>Chroman derivatives of the general formula I <IMAGE> I where A-B is -CH2-CH2-(Ia), -CH=CH-(Ib), -CHOH-CH2-(Ic) or -CO-CH2-(Id), R1 is -CH2-O-R' or <IMAGE> where R' is C1-C4-alkyl or arylmethyl and R'' and R''' are each C1-C4-alkyl, which can also be bonded to form a five-membered or six-membered cyclic acetal, R2 is C1-C4-alkyl and R3 is H or a protective group.</p> |
