Journal
FITOTERAPIA
Volume 143, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fitote.2020.104533
Keywords
Microwave; Cross-dehydrogenative coupling (CDC); Double C-H bond activation; TBHP; Antioxidant; Antiplatelet
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Funding
- DST, New Delhi [DST/INT/South Africa/P-19/2016]
- UGC, New Delhi
- National Research Foundation of Korea (NRF), the Ministry of Education, Science, and Technology [2017R1C1B2003380]
- National Research Foundation of Korea [2017R1C1B2003380] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An efficient, microwave-assisted, oxidant-interceded, transition-metal-free, cross-dehydrogenative Csp(2)-C-sp(3) coupling of C-8-Caffeine 2/Theobromine 3/theophylline 4 with substituted aliphatic alcohols 11a-1 via C-H bond activation for the preparation of series of substituted C-8-(hydroxymethyl) Caffeine 12a-1/theobromine 13a-c/ theophylline 14a-b has been developed using microwave irradiation upto 98% yield. The reaction proceeds smoothly in the presence of tert-butyl hydroperoxide (TBHP) under solvolysis condition at 120 degrees C for 20 min to corresponding substituted C-8-(hydroxymethyl)-methylxanthine derivatives in good to excellent yields. The good substrate scope, control experiments, gram-scale synthesis, and practical synthetic transformations further highlights the practicality of this methodology. These C-8-(hydroxymethyl) Caffeine 12a-1, 13a-c and 14a-b have been found to show promising in vitro antioxidant as well as antiplatelet activities.
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