Journal
CHEMICAL SCIENCE
Volume 8, Issue 1, Pages 524-529Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6sc02646j
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Funding
- Ministry of Science of Technology of Taiwan (MOST) [104-2113-M-007-002-MY3, 104-2113-M-007-014]
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A pseudo-enantiomeric pair of optically switchable helicenes containing a catalytic 4-N-methylaminopyridine (MAP) bottom unit and a C-2-symmetric, (10R, 11R)-dimethoxymethyl-dibenzosuberane top template was synthesized. They underwent complementary photoswitching at 290 nm (P/M', <1/> 99) and 340 nm (P/M', 91/9) and unidirectional thermo-rotation at 130 degrees C (P/M', >99/<1). They were utilized to catalyze enantiodivergent Steglich rearrangement of O- to C-carboxylazlactones, with formation of either enantiomer with up to 91% ee (R) and 94% ee (S), respectively.
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