Reacción #167939

Ecuación de reacción

KOH

3-hydroxy-4-methylphenyl boronic acid

3-((phenylsulfonyl)methylene)oxetane

KOH

→

2-methyl-5-(3-((phenylsulfonyl)methyl)oxetan-3-yl)phenol

Disolventes

dioxane

dioxane

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.WAITAfter 1 h
2. 2
   workup.WAITAfter another 10 min
3. 3
   workup.STIRRINGThe resulting mixture was stirred at room temperature overnight
4. 4
   Otropartitioned between Et2O and aqueous NH4Cl
5. 5
   ExtracciónThe aqueous layer was extracted with Et2O (3×)
6. 6
   Extracción(During extractions
7. 7
   SecadoThe combined organic layers were dried (Na2SO4)
8. 8
   Filtraciónfiltered
9. 9
   Concentraciónconcentrated
10. 10
    OtroThe dark orange residue was purified by silica gel chromatography (30-100% EtOAc/heptane)

Procedimiento

A solution of KOH (1.5 M in water, 14.2 mL, 21.3 mmol) was added to a solution of [Rh(cod)C1]2 (0.525 g, 1.07 mmol) in dioxane (60 mL). The resulting yellow solution was stirred for 1 min. Then, 3-hydroxy-4-methylphenyl boronic acid (6.48 g, 42.6 mmol) and a solution of 3-((phenylsulfonyl)methylene)oxetane (4.48 g, 21.3 mmol) in dioxane (40 mL) were added in that order. After 1 h, a solution of KOH (1.5 M in water, 14.2 mL, 21.3 mmol) was added. After another 10 min, [Rh(cod)Cl]2 (0.525 g, 1.07 mmol) was added. The resulting mixture was stirred at room temperature overnight, and then partitioned between Et2O and aqueous NH4Cl. The aqueous layer was extracted with Et2O (3×). (During extractions, some solids crashed out in the organic layer, but went back into solution over time). The combined organic layers were dried (Na2SO4), filtered, and concentrated. The dark orange residue was purified by silica gel chromatography (30-100% EtOAc/heptane) to provide 2-methyl-5-(3-((phenylsulfonyl)methyl)oxetan-3-yl)phenol. 1H NMR (400 MHz, CD2Cl2) δ ppm 7.52-7.63 (m, 3 H) 7.41 (t, J=7.71 Hz, 2 H) 6.99 (d, J=7.83 Hz, 1 H) 6.57 (dd, J=7.83, 1.77 Hz, 1 H) 6.50 (d, J=2.02 Hz, 1 H) 4.99 (d, J=6.57 Hz, 2 H) 4.91 (d, J=6.57 Hz, 2 H) 4.03 (s, 2 H) 2.20 (s, 3 H)

Fuente