A copper-catalyzed decar-boxylative [3 + 2] cyclization reaction between alkyne-substituted cyclic carbamates and azlactones has been developed, providing optically pure gamma-butyrolactams bearing two adjacent tetrasubstituted carbon stereocenters in high yields with excellent stereo-selectivities (up to 99% yield, 99:1 dr, and 99% ee). This represents the first successful asymmetric synthesis of gamma-butyrolactams containing sterically congested adjacent tetrasubstituted stereocenters via a decarboxylative cyclization pathway.
A copper-catalyzed diastereo-and enantioselective decar-boxylative [3 + 2] cyclization reaction of alkyne-substituted cyclic carbamates with azlactones has been established. A range of optically pure gamma-butyrolactams bearing two vicinal tetrasubstituted carbon stereo-centers were obtained in high yields with good to excellent stereo-selectivities (up to 99% yield, 99:1 dr, and 99% ee). This is the first example of asymmetric synthesis gamma-butyrolactams containing sterically congested vicinal tetrasubstituted stereocenters via a decarboxylative cyclization pathway.
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