Crystalline D-isoglutamyl-D-tryptophan and the mono ammonium salt of D-isoglutamyl-D-tryptophan
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United States of America Patent
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Feb 21, 2012
Grant Date -
Jan 21, 2010
app pub date -
Nov 26, 2007
filing date -
Nov 28, 2006
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Abstract
A process for making pure crystalline D-isoglutamyl-D-tryptophan is provided which includes the step of deprotecting essentially pure N-tert-butoxycarbonyl-D-isoglutamyl-D-tryptophan or its diester to yield essentially pure D-isoglutamyl-D-tryptophan. A process is also provided for the preparation of pure mono ammonium salt of D-isoglutamyl-D-tryptophan from essentially pure N-tert-butoxycarbonyl-D-isoglutamyl-D-tryptophan. D-isoglutamyl-D-tryptophan, ammonium salt (1:1) is a stable pharmaceutical solid.
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