New Aspects of Catalytic Intramolecular C−H Amination: Unexpected Formation of a Seven-Membered Ring in Nitrogen-Containing Systems
作者:Sylvestre Toumieux、Philippe Compain、Olivier R. Martin、Mohamed Selkti
DOI:10.1021/ol061649x
日期:2006.9.1
The first example of the formation of a seven-memberedring by way of intramolecular-catalyzed amination of saturated C-H bonds is reported (Du Bois reaction). The influence of various structural parameters was studied, and it was shown that the unexpected regioselectivity observed in nitrogen-containing systems could be rationalized by conformational factors. These results open the way to innovative
1,3-Cyclic sulfates (1b-d) participate in heterocyclisation reactions to give pyrrolidines (2b) and piperidines (2c/d). Cyclic sulfate activation, when coupled to the enantio- and diastereoselective generation of 1,3-diols, provides a synthesis of (+)-sedridine (9).