Patent · US Expired

Process for the preparation of N-protected dialkyl (2S,3S)-3-ethylaspartates

US5275941A · kind A · utility

0Cited by

2References

6Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Ulrich Heywang · Darmstadt, DE
Harry Schwartz · San Fernando, US
Michael Casutt · Pfungstadt, DE

Key dates

Filing date	Nov 6, 1991
Grant date	Jan 4, 1994
Priority date	—
Expiry date	Nov 6, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07K5/06034
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of N-protected dialkyl (2S,3S)-3-ethylaspartates or their salts from unpurified (2S,3S)-3-ethylaspartic acid obtainable by enzymatic amination of ethylfumaric acid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.