Tetrahedron p. 1685 - 1690 (1988)
Update date:2022-08-05
Topics:
Galpin, I. J.
Mohammed, A. K.
Patel, A.
A proton NMR method has been used to monitor racemisation during the coupling of N-methylated amino acids by the diphenylphosphinic mixed anhydride procedure.No racemisation was observed when urethane protection employed, but use of the benzoyl group led extensive racemisation.The reagent was subsequently used for the assembly of several extensively N-methylated peptides.
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