Uk. Pandit et al., Synthesis mediated by ring-closing metathesis - Applications in the synthesis of azasugars and alkaloids, EUR J ORG C, (5), 1999, pp. 959-968
The application of the ring-closing metathesis (RCM) reaction to the constr
uction of a wide variety of nitrogen-containing ring systems is described.
The examples include pyrrolizidine, indolizidine, and quinolizidine derivat
ives related to azasugars. A formal total synthesis of castanospermine (5)
is presented. The utilisation of two RCM steps in the synthetic sequence le
ading to the multicyclic ABCDE nucleus 7 of the complex alkaloid manzamine
A (6) is discussed.