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56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Abstract Multicomponent reactions offer convenient procedures for the introduction of many points of structural diversity into heterocyclic compounds prepared in a straightforward manner in a single synthetic step. Combining these features with the extremely fast reaction kinetics of microwave-assisted organic synthesis provides new methods for the rapid and efficient synthesis of heterocyclic libraries suitable for biological evaluation and SAR studies.

In the following section, a variety of C – C and C – N cross-coupling reactions under microwave-assisted conditions are described with some illustrative examples. 1 Suzuki Coupling The Suzuki reaction has been successfully used to introduce new C – C bonds into 2-pyridones [75, 83, 84]. The use of microwave irradiation in transitionmetal-catalyzed transformations is reported to decrease reaction times [52]. Still, there is, to our knowledge, only one example where a microwaveassisted Suzuki reaction has been performed on a quinolin-2(1H)-one or any other 2-pyridone containing heterocycle.

Selective C4 monochlorination can be accomplished when the reaction is performed with N1-substituted 2-quinolones, however, when performing the transformation on N-unsubstituted 2-quinolones both the 2 and Scheme 11 Chloro dehydroxylation of 4-hydroxy-2-quinolones under microwave irradiation 18 N. Pemberton et al. 4 positions are chlorinated. A well-designed route to solve this problem was reported by Glasnov et al. who used a microwave-assisted two-step chlorination/hydrolysis sequence to get the monochlorinated product 39 in high yield (b, Scheme 11).

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