(2S)-2-Amino-N,3,3-trimethylbutanamide → 3(R)-(t-butoxycarbonylamino)-N-(2,2-dimethyl-1(S)-(methylcarbamoyl)propyl)succinamic acid allyl ester

Beteiligte Stoffe

Reaktionsschritte

According to Example 1(b) for 3 (R)-t-butyloxycarbonylamino-N-(2,2-dimethyl-1(S)-(methylcarbamoyl)propyl)succinamic acid benzyl ester, β-allyl-N-t-butoxycarbonyl-D-aspartate (Belshaw, P.; Mzengeza, S.; Lajoie, G. Syn Commun 1990, 20, 3157-3160; 2.00 g, 7.32 mmol) and L-t-leucine N-methylarnide (Malon, P.; Pancoska, P.; Budesinsky, M.; Hlavacek, J.; Pospisek, J.; Blaha, K. Coll. Czech. Chem Commun. 1983, 48, 2844-2861; 1.05 g, 7.32 mmol) were coupled with TBTU. The resultant yellow oil was routinely used without further purification. Flash column chromatography with 2% MeOH/CH2Cl2 provided 2.44 g (84%) of 3(R)-(t-butoxycarbonylamino)-N-(2,2-dimethyl-1(S)-(methylcarbamoyl)propyl)succinamic acid allyl ester as a pale yellow oil.

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