반응 #836424

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borane methyl sulfide

(R)-tetrahyro-1-methyl-3,3-diphenyl-1H,3H-pyrrolo[1,2-c] [1,3,2]-oxazaborole

Borane methyl sulfide

4-(benzyloxy)-7-(bromoacetyl)-1,3-benzothiazol-2(3H)-one

→

title compound

수율 69.8%

4-(Benzyloxy)-7-[(1R)-2-bromo-1-hydroxyethyl]-1,3-benzothiazol-2(3H)-one

수율 69.8%

용매

toluene

THF

THF

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후처리

1. 1
   workup.STIRRINGstirred for 10 min at −5° C
2. 2
   기타partitioned between 2N HCl and ethyl acetate
3. 3
   건조The organic solution was dried (MgSO4)
4. 4
   여과filtered
5. 5
   기타evaporated in vacuo
6. 6
   기타The residue was purified on a 5 g silica SPE cartridge
7. 7
   세척eluting with a stepped gradient of 10% to 25% ethyl acetate-cyclohexane mixtures

실험 절차

A solution of [(R)-tetrahyro-1-methyl-3,3-diphenyl-1H,3H-pyrrolo[1,2-c] [1,3,2]-oxazaborole] (22 μl of 1M in toluene) in dry THF(1 ml) was cooled to −5° C., stirring under nitrogen. Borane-methyl sulfide complex (2M solution in THF, 11 μl) was added and stirred for 10 min at −5° C. A solution of 4-(benzyloxy)-7-(bromoacetyl)-1,3-benzothiazol-2(3H)-one (47 mg) in dry THF (1.5 ml) was added dropwise and then another 66 μl of borane-methyl sulfide complex (2M solution in THF). The reaction mixture was left for 72 h at less than 5° C. and then partitioned between 2N HCl and ethyl acetate. The organic solution was dried (MgSO4), filtered and evaporated in vacuo. The residue was purified on a 5 g silica SPE cartridge, eluting with a stepped gradient of 10% to 25% ethyl acetate-cyclohexane mixtures to give the title compound (33 mg). LCMC RT=3.19 min.

출처