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Volumn 132, Issue 30, 2010, Pages 10592-10608

Copper-catalyzed enantioselective propargylic amination of propargylic esters with amines: Copper-allenylidene complexes as key intermediates

Author keywords

[No Author keywords available]

Indexed keywords

ALLENYLIDENE COMPLEXES; CARBON ATOMS; CATALYTIC REACTIONS; CHIRAL LIGAND; DENSITY FUNCTIONAL THEORY CALCULATIONS; DIPHOSPHINES; DIRECT METHOD; ENANTIOSELECTIVE; HIGH ENANTIOSELECTIVITY; IN-SITU; MODEL REACTIONS; OPTICALLY ACTIVE; PROPARGYLIC AMINES; PROPARGYLIC ESTER; RATE DETERMINING STEP; REACTION PATHWAYS; RELATIVE RATE CONSTANTS; SECONDARY AMINES;

EID: 77955025634     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja1047494     Document Type: Article
Times cited : (186)

References (152)
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    • Reactions of 1a with other anilines such as 4-methylaniline, 4-chloroaniline, and 4-trifluoromethylaniline were investigated under the same reaction conditions to give the corresponding propargylic amines in good yields with only a moderate enantioselectivity (45-55% ee). Unfortunately, no propargylic amination occurred at all when primary alkylamines such as tert -butylamine and 1-adamantylamine were used as nucleophiles
    • Reactions of 1a with other anilines such as 4-methylaniline, 4-chloroaniline, and 4-trifluoromethylaniline were investigated under the same reaction conditions to give the corresponding propargylic amines in good yields with only a moderate enantioselectivity (45-55% ee). Unfortunately, no propargylic amination occurred at all when primary alkylamines such as tert -butylamine and 1-adamantylamine were used as nucleophiles
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    • The complex 3b has already been prepared by the Lipshutz group, but the crystallographic structure of 3b has not yet been mentioned: Lipshutz, B. H., Frieman, B., and Birkedal, H. Org. Lett. 2004, 6, 2305
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    • -1, R 1 (wR 2) = 0.0762 (0.1419) for 18 587 unique reflections and 1032 parameters. Heavy disorder among acetylides and dichloromethane prohibited sufficient refinement of the structure
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    • No copper-allenylidene complex has yet been isolated until now, but the first example of a silver-allenylidene complex has recently been reported: Asay, M., Donnadieu, B., Schoeller, W. W., and Bertrand, G. Angew. Chem., Int. Ed. 2009, 48, 4796 Recently, the first example of a palladium-allenylidene complex has been reported: Kessler, F., Szesni, N., Põ~hako, K., Weibert, B., and Fischer, H. Organometallics 2009, 28, 348
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    • Quite recently, we reported the copper-catalyzed enantioselective ring-opening reactions of ethynyl epoxides with amines, where copper-allenylidene complexes were proposed to work as key intermediates: Hattori, G., Yoshida, A., Miyake, Y., and Nishibayashi, Y. J. Org. Chem. 2009, 74, 7603
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    • Separately, we carried out theoretical calculations of the propargylic amination in the absence of one methanol molecule. In this case, the propargylic amination is considered to proceed via copper-vinylidene complexes as key intermediates (Path B; see Supporting Information for experimental details). However, the energy barriers of the propargylic amination via copper-vinylidene complexes (Path B) are relatively higher than those via copper-acetylide complexes (Path A). Thus, Path A is more preferred than Path B. Some copper-catalyzed transformations of terminal alkynes are considered to proceed via copper-vinylidene complexes as key intermediates. For example, see
    • Separately, we carried out theoretical calculations of the propargylic amination in the absence of one methanol molecule. In this case, the propargylic amination is considered to proceed via copper-vinylidene complexes as key intermediates (Path B; see Supporting Information for experimental details). However, the energy barriers of the propargylic amination via copper-vinylidene complexes (Path B) are relatively higher than those via copper-acetylide complexes (Path A). Thus, Path A is more preferred than Path B. Some copper-catalyzed transformations of terminal alkynes are considered to proceed via copper-vinylidene complexes as key intermediates. For example, see: Himo, F., Lovell, T., Hilgraf, R., Rostovtsev, V. V., Noodleman, L., Sharpless, K. B., and Fokin, V. V. J. Am. Chem. Soc. 2005, 127, 210
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    • The X-ray analysis of a major enantioisomer of 2ae indicates that the absolute configuration of 2ae is S. The molecular structure of 2ae was confirmed by X-ray analysis. See Supporting Information for experimental details
    • The X-ray analysis of a major enantioisomer of 2ae indicates that the absolute configuration of 2ae is S. The molecular structure of 2ae was confirmed by X-ray analysis. See Supporting Information for experimental details
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    • The result of the calculated model structure of the copper-allenylidene complex D′ with the collinearity of the Cu-C(α)-C(β)-C(γ) bond and the dihedral angle (C(1)(phenyl)-C(γ)-Cu-O(methanol)) of -90° supports the edge-to-face interaction between the two phenyl groups, where one of the ortho C-H bonds of the phenyl group in the allenylidene ligand is tilting toward one of the phenyl groups at the phosphorous atom in BIPHEP. The phenyl ring centroid-centroid separation (6.09 Å) of these neighboring two phenyl groups is within the range of phenyl ring centroid separations observed for the existence of aromatic-aromatic interactions (3.4-6.5 Å). To obtain more exact information, we are investigating isolation of the copper-allenylidene complex
    • The result of the calculated model structure of the copper-allenylidene complex D′ with the collinearity of the Cu-C(α)-C(β)-C(γ) bond and the dihedral angle (C(1)(phenyl)-C(γ)-Cu-O(methanol)) of -90° supports the edge-to-face interaction between the two phenyl groups, where one of the ortho C-H bonds of the phenyl group in the allenylidene ligand is tilting toward one of the phenyl groups at the phosphorous atom in BIPHEP. The phenyl ring centroid-centroid separation (6.09 Å) of these neighboring two phenyl groups is within the range of phenyl ring centroid separations observed for the existence of aromatic-aromatic interactions (3.4-6.5 Å). To obtain more exact information, we are investigating isolation of the copper-allenylidene complex
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    • Quite recently, we found that edge-to-face aromatic interaction between two the phenyl groups in the ruthenium-allenylidene complex plays a critical role for the ruthenium-catalyzed enantioselective propargylic substitution reactions
    • Quite recently, we found that edge-to-face aromatic interaction between two the phenyl groups in the ruthenium-allenylidene complex plays a critical role for the ruthenium-catalyzed enantioselective propargylic substitution reactions: Kanao, K., Tanabe, Y., Miyake, Y., and Nishibayashi, Y. Organometallics 2010, 29, 2381
    • (2010) Organometallics , vol.29 , pp. 2381
    • Kanao, K.1    Tanabe, Y.2    Miyake, Y.3    Nishibayashi, Y.4
  • 152
    • 70349906446 scopus 로고    scopus 로고
    • During the preparation of this manuscript, the copper-catalyzed enantioselective propargylic alkylation of propargylic acetates with enamines was reported by using our reaction system, where Cl-MeO-BIPHEP and BINAP worked as good chiral ligands
    • During the preparation of this manuscript, the copper-catalyzed enantioselective propargylic alkylation of propargylic acetates with enamines was reported by using our reaction system, where Cl-MeO-BIPHEP and BINAP worked as good chiral ligands: Fang, P. and Hou, X.-L. Org. Lett. 2009, 11, 4612
    • (2009) Org. Lett. , vol.11 , pp. 4612
    • Fang, P.1    Hou, X.-L.2


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