Formation of N-protected bis-3,6-(4-aminobutyl)-2, 5-diketopiperazine through a cyclic alpha-N-protected amino ester

US9944609B2 · kind B2 · utility

Assignee

• MannKind Corporation · US

Inventors

• John J. Freeman · Longmont, US
• Otto Phanstiel · Oviedo, US
• William Elliot Bay · Martinez, US
• Kelly Sullivan Kraft · Hopewell Junction, US

Key dates

• Filing date: Nov 16, 2015
• Grant date: Apr 17, 2018
• Expiry date: Nov 16, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D241/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for the synthesis of N-protected 3,6-aminoalkyl-2,5-diketopiperazines is provided. The method includes obtaining a cyclic α-N protected active amino ester and adding it to a mixture of an amine catalyst in an organic solvent.