反应 #7772

反应方程式

(±)3,4-epoxytetrahydropyran

1-Methanesulfonyl-4-methylsulfanyl-benzene

nBuLi

NH4Cl

BF3 Et2O

→

(±)(3S*,4R*)-4-(4-methylsulfanyl-benzenesulfonylmethyl)-tetrahydro-pyran-3-ol

收率 35.9%

溶剂

EtOAc

THF

反应条件

后处理

1. 1
   workup.ADDITIONAfter an addition 1 h at −78° C.
2. 2
   温度the solution was warmed to 0° C
3. 3
   workup.WAITAfter 2 h
4. 4
   温度the solution was cooled to −78° C.
5. 5
   温度The solution was warmed to rt
6. 6
   洗涤The organic layer was washed with brine
7. 7
   其他dried
8. 8
   过滤filtered
9. 9
   浓缩concentrated

实验过程

1-Methanesulfonyl-4-methylsulfanyl-benzene (4.33 g) was dissolved in THF (50 mL) and cooled to −78° C. prior to the addition of 1.6 M nBuLi (13.4 mL). After 0.5 h, BF3-Et2O (2.7 mL) was added followed (±)3,4-epoxytetrahydropyran (1.2 g) (Tetrahedron 1974, 4013). After an addition 1 h at −78° C., the solution was warmed to 0° C. After 2 h, the solution was cooled to −78° C. and saturated NH4Cl solution (aq) was added. The solution was warmed to rt and EtOAc was added. The organic layer was washed with brine, dried, filtered, and concentrated. Flash chromatography of the resulting residue gave (±)(3S*,4R*)-4-(4-methylsulfanyl-benzenesulfonylmethyl)-tetrahydro-pyran-3-ol (1.3 g) as the major product. MS found: (M+H)+=303.0.

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