反应详情

A 6.13 g. portion of 2'-chloro-3,4-dimethoxybenzoin, 5.6 ml. of triethylamine and 20 ml. of toluene are mixed and stirred. A mixture of 1.55 ml. of methanesulfonyl chloride in 40 ml. of toluene is added over a period of one hour. A 50 ml. portion of water and more toluene are added. The organic layer is separated, washed with water and concentrated in vacuo to give 8.3 g. of 2'-chloro-3,4-dimethoxybenzoin methanesulfonate ester as a viscous oil. A mixture of this oil in 30 ml. of acetone is added to a stirred mixture of 1.95 g. of hexahydro-2H-1,3-diazepine-2-Thione in 150 ml. of acetone. The resulting mixture is stirred for 3 hours, then 3 hours at 45°-50° C., concentrated to 1/3 of its original volume and ether is added producing a gum. The mixture is concentrated free of solvents, 100 ml. of water and 2 ml. of ammonium hydroxide are added and the solid is filtered and washed with water. This solid is dissolved in 20 ml. of ethanol and refrigerated giving 1.3 g. of the desired product, m.p. 98°-100° C.

1. additionA mixture of 1.55 ml
2. customThe organic layer is separated
3. washwashed with water
4. concentrationconcentrated in vacuo
5. customto give 8.3 g
6. additionA mixture of this oil in 30 ml
7. stirringThe resulting mixture is stirred for 3 hours
8. concentration3 hours at 45°-50° C., concentrated to 1/3 of its original volume and ether
9. additionis added
10. customproducing a gum
11. concentrationThe mixture is concentrated free of solvents, 100 ml
12. additionof ammonium hydroxide are added
13. filtrationthe solid is filtered
14. washwashed with water
15. dissolutionThis solid is dissolved in 20 ml
16. customof ethanol and refrigerated giving 1.3 g