Tetrahedron Letters p. 3315 - 3318 (1994)
Update date:2022-08-28
Topics:
Akaji, Kenichi
Kuriyama, Naohiro
Kiso, Yoshiaki
CIP (2-chloro-1,3-dimethylimidazolidium hexafluorophosphate) was an efficient coupling agent for N(α)-protected α-aminoisobutyric acid (Aib) in the presence of an additive. The reactivity was enhanced markedly by a catalytic amount of additive in the order of HOAt ~ HODhbt > DMAP > HOBt. These couplings occurred without detectable racemization.
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