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For direct catalytic asymmetric vinylogous reaction of γ-butenolides, Mannich-type reaction: (a) Yamaguchi, A.; Matsunaga, S.; Shibasaki, M. Org. Lett. 2008, 10, 2319. 1,4-Addition to nitroalkenes:
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(b) Barnes, D. M.; Bhagavatula, L.; DeMattei, J.; Gupta, A.; Hill, D. R.; Manna, S.; McLaughlin, M. A.; Nichols, P.; Premchandran, R.; Rasmussen, M. W.; Tian, Z.; Wittenberger, S. J. Tetrahedron: Asymmetry 2003, 14, 3541. For other synthetic applications and stereoselective transformation of α,βunsaturated γ-butyrolactam unit, see ref la.
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For racemic direct-type vinylogous reactions of α,β- unsaturated γbutyrolactam and related donors, see: (a) Sartori, A.; Curti, C.; Battistini, L.; Burreddu, P.; Rassu, G.; Pelosi, G.; Casiraghi, G.; Zanardi, F. Tetrahedron 2008, 64, 11697.
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The relative and absolute configurations of 5a and 7b were unequivocally determined by X-ray crystallographic analysis. See Supporting Information.
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The relative and absolute configurations of 5a and 7b were unequivocally determined by X-ray crystallographic analysis. See Supporting Information.
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