反応 #59262

反応方程式

chlorosulfonyl isocyanate

4-methoxyaniline

aluminum chloride

→

desired product ( 8 )

収率 95.0%

7-Methoxy-1,1-dioxo-1,4-dihydro-2H-1λ6-benzo[1,2,4]thiadiazin-3-one

収率 95.0%

溶媒

nitroethane

nitroethane

反応条件

後処理

1. 1
   workup.ADDITIONAfter the addition
2. 2
   workup.STIRRINGthe reaction was stirred for an additional 5 minutes
3. 3
   温度The mixture was then quickly heated to 110° C.
4. 4
   workup.STIRRINGwith stirring for 20 minutes
5. 5
   ろ過the precipitate was collected by suction filtration
6. 6
   洗浄washed with cold water
7. 7
   その他dried in vacuo

実験手順

A solution of chlorosulfonyl isocyanate (17 mL, 195 mmol.) was dissolved in 150 mL of nitroethane and cooled to −40° C. A solution of 4-methoxyaniline (Z) (20 g, 162 mmol) in 100 mL of nitroethane was then added drop-wise from a dropper funnel with stirring. After the addition was completed, the reaction was stirred for an additional 5 minutes and aluminum chloride (25 g, 195 mmol) was added. The mixture was then quickly heated to 110° C. with stirring for 20 minutes. The crude material was then poured onto ice and the precipitate was collected by suction filtration, washed with cold water, and dried in vacuo to produce 35 g of the desired product (8) as a purple powder in 95% yield. 1H NMR (400 MHz, DMSO-d6): δ 11.05 (s, 1H), 7.2 (m, 3H), 3.78 (s, 3H), 3.6 (br, 1H).

出典