Sulfuric Acid → tert-Butyl cyclopropanecarboxylate

The esterification was performed following conditions described in Wright, Stephen W.; Hageman, David L.; Wright, Ann S.; Mc Clure, Lester D., Tetrahedron Letters 1997, 38(42), 7345-7348. 8.04 ml (150 mmol) concentrated sulfuric acid was added to a vigorously stirred suspension of 72.22 g (600 mmol) MgSO4 in 450 ml CH2Cl2. The mixture was stirred for 20 min, after which 11.90 ml (150 mmol) of cyclopropanecarboxylic acid was added. 55.59 ml (750 mmol) of tert-butanol was added last. The mixture was sealed tightly and stirred for 18 h at room temperature. The reaction was quenched with aqueous saturated NaHCO3 and stirred until all MgSO4 had dissolved. The aqueous phase was extracted with ether (two times). The organic phases were washed with water (5×), aqueous saturated NaCl solution and dried (Na2SO4) to give 10.38 g of the title compound as volatile, light yellow liquid.

1. customThe mixture was sealed tightly
2. stirringstirred for 18 h at room temperature
3. customThe reaction was quenched with aqueous saturated NaHCO3
4. stirringstirred until all MgSO4
5. dissolutionhad dissolved
6. extractionThe aqueous phase was extracted with ether (two times)
7. washThe organic phases were washed with water (5×), aqueous saturated NaCl solution
8. dry with materialdried (Na2SO4)

ORD record

ord-6ecf723bc2734014817aa433cead4a24

Source dataset

uspto-grants-2007_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07253192B2