Acetylglycine → (N-Acetyl-glycylpropyl)triethoxysilane

A 5 L, 4-neck flask equipped with a heating mantle, a mechanical stirrer, a pot thermometer, an addition funnel, and a short Vigreux column with a distillation head connected to a nitrogen bubbler was charged with 2500 g of ethanol and 146.4 g of N-acetylglycine. This mixture was stirred at room temperature for 15 minutes. 110.5 g of potassium ethoxide were added while maintaining the pot temperature below 50° C. The mixture was heated to a pot temperature of 80° and 362.7 g of 3-iodopropyltriethoxysilane was added. Ethanol was removed by distillation until the pot temperature rose to 90° C. to 95° C. The reaction was followed by GC and heating continued for ˜100 hours until less than 10% of the 3-iodopropyltriethoxysilane remained. The flask and the contents were allowed to cool to room temperature and then filtered to give a clear to slightly hazy solution with 25-30% solids. A sample of solution was stripped of solvent at 120° C. and 1 mm vacuum to remove all solvents and unreacted starting materials. The product was purified by wiped film distillation at 190° C. at 0.5 mm. IR and NMR results were consistent with the target structure.

1. customA 5 L, 4-neck flask equipped with a heating mantle, a mechanical stirrer
2. customa pot thermometer, an addition funnel, and a short Vigreux column with a distillation head connected to a nitrogen bubbler
3. temperaturewhile maintaining the pot temperature below 50° C
4. additionwas added
5. customEthanol was removed by distillation until the pot temperature
6. customrose to 90° C. to 95° C
7. temperatureheating
8. waitcontinued for ˜100 hours until less than 10% of the 3-iodopropyltriethoxysilane
9. temperatureto cool to room temperature
10. filtrationfiltered

ORD record

ord-158a6bd750394d5fb9f53c9dc8a421f2

Source dataset

uspto-grants-2016_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09358200B2