Scheme 11.
Synthetic route to diphenethylamine 69. (a) EDCl and HOAt in CH2Cl2, N2, rt; (b) BH3·THF 1 M in THF, N2, reflux; (c) cyclobutylmethyl bromide, NaHCO3, CH3CN, N2, reflux; (d) BBr3 1 M CH2Cl2 solution in CH2Cl2, −15 °C.
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