Scheme 3a.
a Reagents and conditions: (a) DBH, H2SO4, TFA;22 (b) Na2CO3, Pd(PPh3)4, DME, H2O, 70 °C, overnight; (c) K3PO4, Pd(OAc)2, ligand 1L, dioxane, H2O, 105 °C, 16–20 h
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.