反应详情

温度

-1 °C

In a 250 mL rb flask a suspension of Compound 200 (structure 3 of Scheme XXXIII) (2.28 g, 10 mmol) in 10 mL conc. HCl was cooled to −1° C. and a solution of NaNO2 (0.40 g, 12 mmol) in water (5 mL) was added dropwise in 20 min. The dark yellow suspension was stirred at −1° C. for 1 h and then a solution of SnCl2.2H2O (5.2 g, 15 mmol) in conc HCl (10 mL) was added dropwise in 10 min. The light yellow suspension of Compound 793 was stirred at −1° C. for 2 h and then used directly or kept in a refrigerator at −1° C. until it was used (the crude compound can be stored for at least one month without decomposition).

1. stirringwas stirred at −1° C. for 2 h
2. customkept in a refrigerator at −1° C. until it
3. waitcan be stored for at least one month without decomposition