Amino alcohol and amino sugar synthesis by benzoylcarbamate cyclization
作者:Spencer Knapp、Paivi J. Kukkola、Shashi Sharma、T. G. Murali Dhar、Andrew B. J. Naughton
DOI:10.1021/jo00309a013
日期:1990.10
Reactions of some pyranoside diol monotriflates with nucleophiles and bases
作者:Spencer Knapp、Andrew B. J. Naughton、Carlos Jaramillo、Brenda Pipik
DOI:10.1021/jo00052a058
日期:1992.12
Reaction of pyranoside diol (equatorial) monotriflates with soft, nonbasic nucleophiles is a useful way to make axial heteroatom-substituted and ''epimerized'' pyranosides, particularly where a fused acetal ring inhibits ring contraction. Among the substrates examined (1, 2,3,4,35), only 4 shows a strong tendency to give ring-contracted products. The reaction of 1-3 with more basic nucleophiles (F-, t-BuO-) leads to the anhydrosugars 8, 25, and 26, respectively. The S(N)2 reaction of 35 with tetra-n-butylammonium iodide forms the basis for a new synthesis of the Cerny epoxide 32.