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.
(a) TMSI, Ph3P=O, DCM, rt, 27: 91%, α:β = 11:1; 32: 68%; 44: 67%. (b) 0.2 M HCl/HFIP, DCM/HFIP, 28: 85%; 31: 85%; 33: 83%; 43: 88%. (c) TMSOTf, DMF, 0 °C, 30: 81%. (d) TfOH, DMF, 0 °C, 34: 81%; 36: 91%; 38: 93%; 40: 91%; 42: 80%. (e) DDQ, DCM/H2O, 35: 84%; 37: 75%; 39: 66%; 41: 70%. (f) Pd(OH)2/C, H2 (3.5 atm), THF/H2O/t-BuOH, 61%.
