| 主权项 |
1. A process for preparing a compound (IIIa) comprising (i) reacting a compound of formula (IV) with a Grignard reagent R1MgQ (V), wherein: R is an organic group; Q is R1 or X, wherein X is halogen; and R1 is (C1-C10)-alkyl, (C2-C10)-alkenyl, (C2-C10)-alkynyl, (C3-C8)-cycloalkyl or (C6-C10)-aryl, wherein the aryl is unsubstituted or substituted by one, two or three groups independently selected from the group consisting of halogen and (C1-C4)-alkyl. |
