Process for preparing phosphorodiamidites
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United States of America Patent
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Oct 2, 2007
Grant Date -
Jun 15, 2006
app pub date -
Dec 18, 2003
filing date -
Dec 24, 2002
priority date (Note) -
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Abstract
A method of phosphorodiamidite production comprising the steps of reacting a phosphorus trihalide with a dialkyl amine in a polar solvent to form an intermediate compound. This intermediate compound is then subsequently reacted with an hydroxylalkyl compound and a dialkyl amine in the presence of a non-polar cosolvent. Following filtration to remove the solid by-product the two solvents form separate layers. This is advantageous as the upper, non-polar solvent, layer contains the high-purity phosphorodiamidite product.
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