| http://www.w3.org/ns/prov#value | - In a further example, a compound of formula (1) wherein R9 is a CONR11 R12 group may be prepared by reaction of a compound of formula (1) wherein R9 is a CONHR11 group with a reagent R12 L (where L is a leaving group as described above) in the presence of a base, for example sodium hydride, in a solvent, such as tetrahydrofuran, at low temperature, for example 0??? C.
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