Several new polyhydroxylated alkaloids including pyrrolidines with a long side chain and 3-(hydroxymethyl) indolizidines were prepared from a common nitrone easily obtained from d-arabinose. In addition, a total synthesis of hyacinthacine A2 has been achieved in five steps and 67.7% overall yield starting from the same d-arabino-derived nitrone. All synthesized compounds have a common structural feature
Synthesis of Pentahydroxylated Pyrrolizidines and Indolizidines
作者:Juan A. Tamayo、Francisco Franco、Daniele Lo Re、Fernando Sánchez-Cantalejo
DOI:10.1021/jo900801c
日期:2009.8.7
been used in the synthesis of pentahydroxylated pyrrolizidines (8 and 10) and indolizidines (9 and 11). The pyrrolizidinic and indolizidinic skeletons were built after internal n-alkylation of the suitably functionalized pyrroloisoxazolidine intermediates obtained by the necessary protecting group manipulations. This method expands the scope of cycloaddition reactions in the synthesis of new and highly