Scheme 2.
Reagents and conditions: (a) FmocCl, NaH, THF, 0 °C (92%); (b) NaBH4, CH3OH, 0 °C (86%); (c) DBU, CH2Cl2, 23 °C (85%); (d) BnOH, CSA, 4Å mol. sieves, CH2Cl2, 23 °C (55%).
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.