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. Author manuscript; available in PMC: 2019 Nov 12.
Published in final edited form as: J Am Chem Soc. 2019 Sep 25;141(40):16108–16116. doi: 10.1021/jacs.9b08484

Scheme 1. Synthesis of Ligands L1 and L2a.

Scheme 1.

aConditions: (i) BF3·Et2O, 100 °C, 2 h; (ii) Pd(PPh3)4, NaHCO3, H2O, toluene, tert-butanol, 80 °C, 6 h; (iii) HBF4 (35% aqueous solution), MeOH, CHCl3, 12 h; (iv) 4 Å molecular sieve, DMSO, 120 °C, 24 h.