Scheme 7.
Bicyclisation of 55–58. Reagents and conditions: a) NaH, DMF, 50 °C, 2 h; b) I2, CH3CN, rt, overnight.
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.