A convenient preparation of N-(alkoxycarbonyl)-2,3-didehydroaspartic acid anhydrides 4 with substitution at the 3-position is reported. The key step is a cobalt-mediated acylation of an acetylene moiety, producing the highly functionalized didehydroamine acid derivative in good yield. Unnatural didehydroaspartates are readily accessible.
A convenient preparation of N-(alkoxycarbonyl)-2,3-didehydroaspartic acid anhydrides 4 with substitution at the 3-position is reported. The key step is a cobalt-mediated acylation of an acetylene moiety, producing the highly functionalized didehydroamine acid derivative in good yield. Unnatural didehydroaspartates are readily accessible.
A convenient preparation of N-(alkoxycarbonyl)-2,3-didehydroaspartic acid anhydrides 4 with substitution at the 3-position is reported. The key step is a cobalt-mediated acylation of an acetylene moiety, producing the highly functionalized didehydroamine acid derivative in good yield. Unnatural didehydroaspartates are readily accessible.