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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Zhang, J. Chem. Commun. 2000, 117. Ma, S.; Li, L. Org. Lett. 2000, 2, 941. Ma, S.; Duan, D.; Shi, Z. Org. Lett. 2000, 2, 1419. Ma, S.; Zhao, S. Org. Lett. 2000, 2, 2495. Ma, S.; Xie, H. Org. Lett. 2000, 2, 3801. Ma, S.; Wei, Q.; Wang, H. Org. Lett. 2000, 2, 3893. Ma, S. S.; Gao, W. Tetrahedron Lett. 2000, 41, 8933. Ma, S.; Wu, S. Chem. Commun. 2001, 441. Ma, S.; Shi, Z.; Wu, S. Tetrahedron: Asymmetry 2001, 12, 193.
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For some of our most recent work in this area, see: Ma, S.; Wei, Q. Eur. J. Org. Chem. 2000, 1939. Ma, S.; Li, L.; Wei, Q.; Xie, H.; Wang, G.; Shi, Z.; Zhang, J. Pure Appl. Chem. 2000, 9, 1739. Ma, S.; Xie, H.; Wang, G.; Zhang, J.; Shi, Z. Synthesis 2001, 713. Ma, S.; Li, L. Synlett 2001, 1206.
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For some of our most recent work in this area, see: Ma, S.; Wei, Q. Eur. J. Org. Chem. 2000, 1939. Ma, S.; Li, L.; Wei, Q.; Xie, H.; Wang, G.; Shi, Z.; Zhang, J. Pure Appl. Chem. 2000, 9, 1739. Ma, S.; Xie, H.; Wang, G.; Zhang, J.; Shi, Z. Synthesis 2001, 713. Ma, S.; Li, L. Synlett 2001, 1206.
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For some of our most recent work in this area, see: Ma, S.; Wei, Q. Eur. J. Org. Chem. 2000, 1939. Ma, S.; Li, L.; Wei, Q.; Xie, H.; Wang, G.; Shi, Z.; Zhang, J. Pure Appl. Chem. 2000, 9, 1739. Ma, S.; Xie, H.; Wang, G.; Zhang, J.; Shi, Z. Synthesis 2001, 713. Ma, S.; Li, L. Synlett 2001, 1206.
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For the synthesis of α-pyrone derivatives via the reaction of methyl cyano-, aceto-, or methoxycarbonyl acetate through the possible intermediate of allenyl ketones in low yields, see: Sugita, T.; Mimura, H.; Ito, H. Chem. Express 1987, 2, 37. For an earlier example of synthesis of α-pyrones from allenes, see: Mirzabekyants, N. S.; Cheburkov, Y. A.; Knunyants, I. L. Izv. Akad. Nauk SSSR, Ser. Khim. 1977, 2517.
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For the synthesis of α-pyrone derivatives via the reaction of methyl cyano-, aceto-, or methoxycarbonyl acetate through the possible intermediate of allenyl ketones in low yields, see: Sugita, T.; Mimura, H.; Ito, H. Chem. Express 1987, 2, 37. For an earlier example of synthesis of α-pyrones from allenes, see: Mirzabekyants, N. S.; Cheburkov, Y. A.; Knunyants, I. L. Izv. Akad. Nauk SSSR, Ser. Khim. 1977, 2517.
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0042824046
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note
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3 in 1 mL of acetone was heated to reflux with stirring. After the reaction was complete (monitored by TLC, eluent = 6:1 hexane/ethyl acetate), the solvent was evaporated and the crude product was purified by chromatography on silical gel (6:1 hexane/ethyl acetate) to afford 199 mg (79%) of 3a.
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