Реакция #1865302

Уравнение реакции

1,1-diethoxy-5-methyl-5-(tetrahydro-2H-pyran-2-yloxy)hex-3-yn-2-one

4-phenyl-1,3-dithiolane-thione

→

2,2-diethoxy-1-(5-(2-(tetrahydro-2H-pyran-2-yloxy)propan-2-yl)-2-thioxo-1,3-dithiol-4-yl)ethanone

Растворители

dichloromethane

Условия реакции

Обработка

1. 1
   ДругоеAfter completion of the reaction
2. 2
   Температураcooled
3. 3
   Другоеthe target compound 4 was purified by radial chromatography
4. 4
   ПромывкаThe target compound 4 eluted as the third fraction with a mixture of dichloromethane and hexanes (60:40)

Методика

A mixture of 1,1-diethoxy-5-methyl-5-(tetrahydro-2H-pyran-2-yloxy)hex-3-yn-2-one 3 (1.5 g, 5.0 mmol) and 4-phenyl-1,3-dithiolane-thione (5.3 g, 25.0 mmol) was heated under N2 at 130° C. for 1 hour. The reaction was monitored by thin layer chromatography using silica gel as the stationary phase and dichloromethane as the mobile phase. The color of the reaction mixture changed from yellow to dark orange. After completion of the reaction, as evidenced by TLC, the reaction was stopped, cooled, and the target compound 4 was purified by radial chromatography using silica gel as the stationary phase. The target compound 4 eluted as the third fraction with a mixture of dichloromethane and hexanes (60:40). The first band was the excess 4-phenyl-1,3-dithiolane-thione, and the second band yielded 2,2-diethoxy-1-(5-(2-(tetrahydro-2H-pyran-2-yloxy)propan-2-yl)-2-thioxo-1,3-dithiol-4-yl)ethanone 5 which was further converted to 4-(diethoxymethyl)-4-hydroxy-6,6-dimethyl-4,6-dihydro-[1,3]dithiolo[4,5-c]furan-2-thione 4.

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