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Beilstein J. Org. Chem. 2013, 9, 628–632, doi:10.3762/bjoc.9.70
Graphical Abstract
Scheme 1: Carbolithiation of ureas 1.
Scheme 2: Diastereospecific carbolithiation of ureas 3.
Scheme 3: Diastereospecific carbolithiation of ureas 5.
Figure 1: X-ray crystal structure of urea 6c.
Scheme 4: Synthesis of N-alkenyl carbamates 9–11.
Figure 2: X-ray crystal structure of carbamate E-10.
Scheme 5: Umpolung carbolithiation of carbamates 9 and 10.