| 摘要 |
<p>A process for the preparation of a compound of the general formula I <CHEM> is described according to which a compound of the general formula IIb <CHEM> is reacted with a compound of formula III L - R<1> - S - R<2> (III) in which L represents a leaving group, generally carrying out the reaction in the presence of a base. R<1> represents an alkylene, alkenylene or alkynylene group, having from 1 to 4 carbon atoms, and R<2> represents a heterocyclic group having a five-membered or 6-membered ring with 1 to 4 heteroatoms, selected from oxygen sulfur and nitrogen, and being linked to the adjacent sulphur atom via a ring carbon atom.</p> |
