Scheme 5.
Reagents and conditions: (i) K2CO3, catalytic KI and 18-crown-6, dry acetonitrile, 150 Watt, 140 °C, 1 h (X = -O-: 5a, X = -NH-: 5b).
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.