[CH:1]1([NH:4][C:5](=[O:19])[CH:6]([OH:18])[CH:7]([NH:11]C(=O)OCC=C)[CH2:8][CH2:9][CH3:10])[CH2:3][CH2:2]1.CN1C(=O)CC(=O)N(C)C1=O>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C(Cl)Cl>[NH2:11][CH:7]([CH2:8][CH2:9][CH3:10])[CH:6]([OH:18])[C:5]([NH:4][CH:1]1[CH2:2][CH2:3]1)=[O:19]Allyl 1-(cyclopropylamino)-2-hydroxy-1-oxohexan-3-ylcarbamate bound resin M1B (30 g, 1.0 eq.) was swollen with DCM. 1,3-Dimethylbarbituric acid (24.17 g, 12 eq.) and tetrakis(triphenylphosphine)palladium (1.49 g, 0.1 eq.) were added and the mixture shaken overnight. The mixture was filtered and washed with DMF and DCM to yield the resin M1D.
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