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Elevated temperature or prolonged reaction time all resulted in undesired desilylation of 41a / 41b leading to 42a / 42b
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Elevated temperature or prolonged reaction time all resulted in undesired desilylation of 41a / 41b leading to 42a / 42b.
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Also compare many examples in:;;, For previous investigations on substrate-induced stereoselective reduction of propargyl ketones, see;;; Tetrahedron 2003, 59, 8613-8622
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Also compare many examples in: Evans, D. A.; Rieger, D. L.; Gage, J. R. Tetrahedron Lett. 1990, 31, 7099-7100 For previous investigations on substrate-induced stereoselective reduction of propargyl ketones, see; Chakraborty, T. K.; Reddy, V. R.; Reddy, T. J. Tetrahedron 2003, 59, 8613-8622
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Such reactions typically occur under basic conditions. For some examples (kindly provided by one of the reviewers) of related cyclization under acidic conditions, see
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Such reactions typically occur under basic conditions. For some examples (kindly provided by one of the reviewers) of related cyclization under acidic conditions, see: Chakraborty, T. K.; Das, S.; Raju, T. V. J. Org. Chem. 2001, 66, 4091-4093
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Dehmlow, H.; Multzer, J.; Seilz, C.; Strecker, A. R.; Kohlmann, A. Tetrahedron Lett. 1992, 33, 3607-3610 For a recent review on stereoselective construction of THF rings, see: Wolfe, J. P.; Hay, M. B. Tetrahedron 2006, 63, 261-290
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0001676754
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3SnH reduction of azides, but they all required AIBN (2,2′-azobis(2-methylpropionitrile)) to initiate the reactions:;, and the refs cited therein
-
3SnH reduction of azides, but they all required AIBN (2,2′-azobis(2-methylpropionitrile)) to initiate the reactions: Hays, D. S.; Fu, G. J. Org. Chem. 1998, 63, 2796-2797 and the refs cited therein.
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101
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77955168630
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Those steps that are not given in this section were reported in the Supporting Information for ref 8
-
Those steps that are not given in this section were reported in the Supporting Information for ref 8.
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