1: With Rink resin; trimethyl orthoformate
T=25°C; 2 h;
2: With lithium borohydride in tetrahydrofuran
T=65°C; 5 h;
3: With trifluoroacetic acid in dichloromethane
T=25°C;
Dey; Rajagopalan
Archiv der Pharmazie (Weinheim, Germany), 1939 , vol. 277, p. 359,377, 394
Proceedings of the National Institute of Sciences of India, 1940 , vol. 6, p. 135,167