Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 30, Pages 8681-8685Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201702461
Keywords
asymmetric reduction; enoate reductases; green chemistry; photocatalysis; redox enzymes
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Funding
- National Research Foundation (NRF) via the Creative Research Initiative Center, Republic of Korea [NRF-2015 R1A3A2066191]
- Netherlands Organisation for Scientific Research by a VICI grant [724.014.003]
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Enoate reductases from the family of old yellow enzymes (OYEs) can catalyze stereoselective trans-hydrogenation of activated C=C bonds. Their application is limited by the necessity for a continuous supply of redox equivalents such as nicotinamide cofactors [NAD(P)H]. Visible light-driven activation of OYEs through NAD(P) H-free, direct transfer of photoexcited electrons from xanthene dyes to the prosthetic flavin moiety is reported. Spectroscopic and electrochemical analyses verified spontaneous association of rose bengal and its derivatives with OYEs. Illumination of a white light-emitting-diode triggered photoreduction of OYEs by xanthene dyes, which facilitated the enantioselective reduction of C=C bonds in the absence of NADH. The photoenzymatic conversion of 2-methylcyclohexenone resulted in enantiopure (ee > 99%) (R)-2-methylcyclohexanone with conversion yields as high as 80-90%. The turnover frequency was significantly affected by the substitution of halogen atoms in xanthene dyes.
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