Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 85, Issue 5, Pages 2855-2864Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.9b03047
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Funding
- National Science Foundation [CHE 1800510]
- Natural Science and Engineering Research Council (NSERC) [2019-04205]
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We report a method for the regioselective photochemical sp(3) C-H fluorination of acetonide ketals that presents interesting problems in chemical reactivity. The question of why certain products of the reaction are stable while others are not is addressed, as is the question of why only select a ethereal hydrogen atoms are targeted in the reaction. We demonstrate that the method can be employed to synthesize unprecedented fluorinated sugars and steroids, and it can also be applied toward the fluorination of carbamates. Though some substrates contain up to eight discrete alpha-ethereal C-H bonds, we observed site-selectivity in each case, prompting us to investigate potential transition states for the reaction. Finally, a remarkable regiochemical switch upon minor structural modification of a diketal is also analyzed.
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