tert-butyl (4-bromobutyl)carbamate synthesis

8synthesis methods

Product Name:tert-butyl (4-bromobutyl)carbamate
CAS Number:164365-88-2
Molecular formula:C9H18BrNO2
Molecular Weight:252.15

13325-10-5 Synthesis

13325-10-5
314 suppliers
$10.00/1g

24424-99-5 Synthesis

24424-99-5
840 suppliers
$13.50/25G

164365-88-2
121 suppliers
$31.00/100mg

Yield:164365-88-2 80%

Reaction Conditions:

Stage #1:4-Aminobutanol;di-tert-butyl dicarbonate with triethylamine in acetonitrile at 0; for 6 h;
Stage #2: with carbon tetrabromide;triphenylphosphine in tetrahydrofuran for 3 h;

Steps:

Synthesis of tert-butyl (4-bromobutyl)carbamate (10)
To a solution of 4-amino-1-butanol (1.50 g, 16.8 mmol) in MeCN (150 mL) were added TEA (4.68 mL) and Boc2O (4.03 g, 18.5 mL) at 0 °C. The mixture was stirred for 6 h and quenched with water. The mixture was poured onto water and extracted with EtOAc three times. The combined organic layers were dried over Na2SO4 and concentrated under reduced pressure. The crude product 6 (2.68 g) was used without further purification. The crude product 6 was dissolve in THF (130 mL) followed by addition of Ph3P (7.06 g, 26.9 mmol). Then CBr4 (8.92 g, 26.9 mmol) was slowly added to the mixture. After 3 h, the solution was filtered through Celite? pad and washed with Et20. The solvents were removed under reduced pressure. The residue was purified by flash chromatography on silica (hexane:EtOAc = 3:1) to yield a colourless oil (4.38 g, 80percent).‘H NMR (500 MHz, CDC13) 4.54 (br s, 1H), 3.43 (t, J= 6.7 Hz, 2H), 3.17 (q, J= 6.7 Hz, 2H), 1.90 (dt, J= 14.8, 6.8 Hz, 2H), 1.65 (m, 2H), 1.45 (s, 9H).

References:

UNIVERSITY OF ADELAIDE;ABELL, Andrew;POLYAK, Steven;TIEU, William;BOOKER, Grant;JUN, Kwang Lee;RODRIGEZ, Beatriz Blanco WO2020/87122, 2020, A1 Location in patent:Page/Page column 26; 27

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