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Part-IIContents2.3.2.1 Mononuclear pyrimidine libraries through MWI 2962.3.2.2 Condensed pyrimidine libraries through MWI 3022.4. Conclusions 3052.5. Drawbacks associated with MWI 3062.6. References 3073. Aim of the present work 3104. Results and discussion 3214.1 Synthesis of starting materials 3214.2 Synthesis of condensed 2-substitutedpyrimidines 3234.3 Synthesis of condensed 4-chloro 2-substitutedpyrimidin using MWIirradiation4.4 Spectral discussion 3384.5 MDR reversal activity of condensed pyrimidines 3534.6 References 3615. Experimental 3625.1 Synthesis of chloroacetonitrile 3625.2 Synthesis of thiophene o-aminoesters and other cyclic o-aminoesters 3625.3 Synthesis of condensed 2-chloromethylpyrimidin-4(3H)-ones undermicrowave irradiation (MWI) (Vi-xvii)5.4 Synthesis of condensed 2-chloroethylpyrimidin-4(3H)-ones underMicrowave Irradiations (MWI) (Vxviii-xxiv)5.5 Synthesis of condensed 2-methylpyrimidin-4(3H)-ones under MicrowaveIrradiation (MWI) (Vxxv-xxx)5.6 Synthesis of condensed 4-chloro-2-chlormethylpyrimidines undermicrowave irradiations (MWI) (VIi-xiii)5.7 Synthesis of condensed 4-chloro-2-chloroethylpyrimidines underMicrowave Irradiation (MWI) (VIxiv-xvii)5.8 Synthesis of condensed 4-chloro-2-methylpyrimidines under MicrowaveIrradiation (MWI) (VIxviii-xxii)5.9 Protocol for MDR reversal activity of condensed pyrimidines 3855.10 References 386331363370373375381382