| 摘要 |
There is described a process for the preparation of compounds of formula I <CHEM> in which R is hydrogen, optionally substituted alkyl, optionally substituted alkenyl optionally substituted cycloalkyl, optionally substituted phenyl or optionally substituted heterocyclyl, and R<1> and R<2> are hydrogen, an organic radical or together with the ring to which they are attached, form an optionally substituted ring, which may contain one or more hetero atoms, which comprises reacting a compound of formula II <CHEM> with a compound of formula III <CHEM> in which the ring Q is an optionally substituted heteroaromatic ring, which optionally comprises one or more further hetero atoms and to which is optionally fused an optionally substituted ring. |
