1: in tetrahydrofuran T=20°C; 18 h; 2: With sulfuric acid in tetrahydrofuran T=0°C;
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Chan, Louis K. M.; Poole, Darren L.; Shen, Di; Healy, Mark P.; Donohoe, Timothy J.
Angewandte Chemie - International Edition, 2014 , vol. 53, # 3 p. 761 - 765
Angew. Chem., 2014 , vol. 126, # 3 p. 908