ChemicalBook CAS DataBase List Ethyl 2-isobutylacetoacetate

Ethyl 2-isobutylacetoacetate synthesis

4synthesis methods

Product Name:Ethyl 2-isobutylacetoacetate
CAS Number:1522-34-5
Molecular formula:C10H18O3
Molecular Weight:186.25

78-77-3 Synthesis

78-77-3
338 suppliers
$14.00/5g

141-97-9 Synthesis

141-97-9
789 suppliers
$5.00/25g

1522-34-5
71 suppliers
$45.00/25mg

Yield: 56%

Reaction Conditions:

Stage #1:ethyl acetoacetate with sodium hydride in N,N-dimethyl-formamide;mineral oil at 60; for 1 h;
Stage #2:Isobutyl bromide in N,N-dimethyl-formamide;mineral oil at 90; for 3 h;

Steps:

1
Preparation Example 1 - Ethyl 2-acetyl-4-methylpentanoate To a solution of 100 g (0.77 mol) of ethyl acetoacetate in 500 ml of DMF 30.7 g (0.77 mol) of 60% suspension of NaH in mineral oil was added in small portions by vigorous stirring at 60°C. This mixture was additionally stirred for 1 h, and then 105.5 g (0.77 mol) of isobutylbromide was added. The resulting mixture was stirred for 3 h at 90°C, then cooled to room temperature, and 1500 ml of cold water was added. The product was extracted by 3 x 300 ml of dichloromethane. The combined organic extract was evaporated at reduced pressure using rotary evaporator. Fractional rectification of the residue gave the title product, b.p. 75- 80°C/4 mm Hg. Yield 80.5 g (56%).Anal. calc. for Ci₀Hi₈O₃: C, 64.49; H, 9.74. Found: C, 64.20; H, 3.81.1H NMR (CDC1₃): δ 4.13 (q, J = 7.2 Hz, 2H, CH₂Me), 3.44 (dd, J = 8.3 Hz, J = 6.6 Hz, 1H, CHCOMe), 2.16 (s, 3Η, COMe), 1.74 (m, 1Η, CHH'TV), 1.62 (CHH'TV), 1.47 (sept, J = 6.6 Hz, 1H, CHMe₂), 1.21 (t, J = 7.2 Hz, 3H, CH₂ e), 0.85 (d, J = 6.6 Hz, 6H, CUMe₂).

References:

BOREALIS AG;CASTRO, Pascal;RESCONI, Luigi;HUHTANEN, Lauri WO2012/1052, 2012, A2 Location in patent:Page/Page column 36-37