A concise and scalable route to L-azidohomoalanine

Area of Science:

• Biochemistry
• Organic Chemistry
• Chemical Biology

Background:

• Chemically modified amino acids are crucial for introducing bioorthogonal handles into proteins.
• Previous methods for synthesizing L-azidohomoalanine (L-Aha) suffer from high costs, low efficiency, and poor scalability.
• There is a need for improved synthetic routes to L-Aha and its analogues.

Purpose of the Study:

• To develop a concise and highly efficient synthetic route to L-azidohomoalanine (L-Aha) and its homologues.
• To provide a scalable and cost-effective method for producing L-Aha.
• To enable the incorporation of L-Aha into proteins for bioorthogonal applications.

Main Methods:

• The synthesis starts from inexpensive N-Boc-O-Bn-L-aspartic acid.
• The route is designed to be concise, efficient, and scalable.
• Gram quantities of L-Aha hydrochloride can be prepared with high purity.

Main Results:

• A highly efficient synthetic route to L-azidohomoalanine (L-Aha) and its homologues was established.
• The synthesis avoids expensive starting materials and overcomes scalability issues.
• Gram quantities of L-Aha hydrochloride were prepared with high purity within one week.
• The synthesized L-Aha can be incorporated into proteins using L-methionine auxotrophs.

Conclusions:

• The developed synthetic route provides a practical and efficient method for producing L-Aha.
• This advancement facilitates the use of L-Aha for introducing bioorthogonal handles in protein engineering.
• The method is suitable for large-scale preparation and application in biological systems.