Ls. Richter et Tr. Gadek, A SURPRISING OBSERVATION ABOUT MITSUNOBU REACTIONS IN SOLID-PHASE SYNTHESIS, Tetrahedron letters, 35(27), 1994, pp. 4705-4706
The Mitsunobu reaction of N-Boc-L-Tyrosine methyl eater with hydroxyme
thyl polystyrene resin proceeds in practically quantitative yield in t
he presence of a tertiary amine. Coupling yields in the absence of an
amine are significantly lower.