反应详情

A mixture of 1.0 g (0.006 m) of N-chloroacetyl-N-methylcarbamoyl chloride and 1.0 g (0.006 m) of 2,3-dihydro-2,2-dimethyl-7-benzofuranol in 15 cc dry toluene was stirred under nitrogen and 0.61 g (0.006 m) of triethylamine was added dropwise over a period of 10 mts. The mixture was stirred for an additional period of 2 hrs., filtered through a bed of celite and then the solvent was stripped off under reduced pressure to yield 1.39 g (yield 77%) of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl N-chloroacetyl-N-methylcarbamate, a light yellow oil. NMR (CDCl3): δ 7.3-6.6 (mn,3H); 4.75(s,2H); 3.40 (s,3H); 3.05 (s,2H) and 1.45 (s,6H). IR (CHCl3): ν1760 and 1725 cm-1

1. stirringThe mixture was stirred for an additional period of 2 hrs
2. filtration, filtered through a bed of celite