Scheme 5.
Reagents and conditions: (a) Cu(OAc)2, MeOH, O2, 70 °C; 12 h; (b) Cu(OAc)2, pyridine, CH2Cl2, rt, 7 d.
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.