反应详情

To a solution of o-tolualdehyde chlorooxime (26.8 g, 0.158 mole), 3-methylenephthalide (14.6 g, 0.1 mole) and ether (400 ml.) was added dropwise a solution of triethylamine (16 g, 0.158 mole) in 30 ml. of ether at 5°-10° C. in 45 minutes. The mixture was stirred at room temperature for 40 hours and filtered. The solid material collected was dissolved in 1 liter of chloroform and 200 ml. of water. The chloroform solution was then washed two times with water, dried over CaSO4 and concentrated under vacuum to give 16.4 g of white solid, m.p. 146°-149° C. The original ether solution was washed two times with water, dried over CaSO4 and concentrated to 100 ml. Another 1.64 g of the spiro compound precipitated out. The ether solution was then further concentrated to 10.8 g of yellow-brown oil which did not contain a significant amount of the desired product. Recrystallization of 12 g of the crude spiro compound from tetrahydrofuran-ether gave 9.87 g of a pure white solid, m.p. 159°-164° C. with decomposition.

1. filtrationfiltered
2. customThe solid material collected
3. dissolutionwas dissolved in 1 liter of chloroform
4. washThe chloroform solution was then washed two times with water
5. dry with materialdried over CaSO4
6. concentrationconcentrated under vacuum