反应详情

20.22 g (0.157 mol) of 4-amino-2-chloropyridine were diluted in triethylamine (67 ml) and dichloromethane (600 ml) at 0-5° C. 47 g of Mercury(II) chloride (0.173 mol) and 50.24 g (0.173 mol) of N,N′-bis(boc)-S-methyl-isothiourea were added to the reaction mixture, which was then stirred at room temperature for 4 days, filtered on a fritted funnel, concentrated in vacuo and chromatographed on silica (Heptane90/AcOEt10) to yield 43.67 g of di-tert-butyl{(Z)-[(2-chloropyridin-4-yl)amino]methylylidene}biscarbamate (yield=71%).

1. customat 0-5° C
2. filtrationfiltered on a fritted funnel
3. concentrationconcentrated in vacuo
4. customchromatographed on silica (Heptane90/AcOEt10)