Scheme 4a.
aReagents and conditions: (i) PhCH2COCl, Et3N, DMAP, CH2Cl2, 5h, (4S,5R)-1 (81%), (4R,5S)-1 (77%); (ii) 4-acetyl-phenyl isocyanate, Et3N, DMAP, CH2Cl2, 5h, (4S,5R)-2 (80%), (4R,5S)-2 (82%).
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.