Scheme 20.
Synthesis of PAs using the N-split Ugi reaction. Reagents and conditions: (a) MeOH; (b) BH3 THF, then H2, Pd(OH)2/C, MeOH.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.