Coupling of substituted 2-iodoanilines with Me (S)-2-[di(tert-butoxycarbonyl)amino]-5-oxopentanoate, derived from glutamic acid, in DMF in the presence of Pd(OAc)2 and DABCO provides substituted tryptophans in good to excellent yields. [on SciFinder (R)]
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Zhu et al. (2005) studied this question.