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DOI: 10.1055/s-2004-829577
Manganese-Catalyzed Oxidative Transformation of Silyl Ethers to Ketones: Enantioselective Synthesis of Optically Active β- and γ-Siloxyketones
Publication History
Publication Date:
15 July 2004 (online)
Abstract
(Salen)manganese(III)-catalyzed oxidation of silyl ethers with iodosylbenzene gave the corresponding carbonyl compounds. The enantioselective oxidation of symmetrical 1,3- and 1,4-disilyl ethers gave the corresponding optically active b- and g-siloxyketones, respectively (up to 93% ee).
Key words
asymmetric oxidation - silyl ethers - manganese catalyst - iodosylbenzene - siloxyketones
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References
The absolute configuration of 6 was determined after converting to the corresponding (R)- and (S)-α-methoxy-α-(trifluoromethyl)phenylacetic acid esters (MTPA esters).
21The absolute configuration of 8 was assigned in comparison with the reported optical rotation value after converting to 4-hydroxytetralone. [13]
26Solvent CH2Cl2, 10 °C; [silyl ether] = 2.0 × 10-1 M; [1] = 1.0 × 10-3 M; [PhIO] = 2.0 × 10-2 M.