1-Bromo-2-methylpropane → (4S)-2-(4-methoxycarbonyl-2-methylphenylimino)-3,4-diisobutyl-1,3-thiazolidine

Participants

Reaction Steps

(1S)-1-(Hydroxymethyl)-1-methylbutylamine was made from (L)-leucine methyl ester as described in Method B1b. The 2-hydroxyethylamine was converted to (1S)-1-(chloromethyl)-3-methylbutanammonium chloride as described in Method B7a. 4-(Methoxycarbonyl)-2-methylphenyl isothiocyanate was reacted with (1S)-1-(chloromethyl)-3-methylbutanammonium chloride according to Method C1a to give (4S)-2-(4-(methoxycarbonyl)-2-methylphenylimino)-4-isobutyl-1,3-thiazolidine. The thiazolidine was reacted with isobutyl bromide according to Method D2a to give (4S)-2-(4-(methoxycarbonyl)-2-methylphenylimino)-3,4-diisobutyl-1,3-thiazolidine. The thiazolidine was saponified according to Method D6a, Step 1 to give (4S)-2-(4-carboxy-2-methylphenylimino)-3,4-diisobutyl-1,3-thiazolidine. The acid was coupled with ammonia as described in Method D6a, Step 2 to afford (4S)-2-(4-carbamoyl-2-methylphenylimino)-3,4-diisobutyl-1,3-thiazolidine.

Provenance & Evidence