Reductive cyclization of N-iodoalkyl cyclic imides to nitrogen-fused polycyclic amides induced by samarium diiodide
作者:Deok-Chan Ha、Chang-Soo Yun、Eunsun Yu
DOI:10.1016/0040-4039(96)00374-7
日期:1996.4
SmI2-promoted cyclizations of cyclicimides having 3-iodopropyl or 4-iodobutyl groups on the imide nitrogen have been studied for construction of nitrogen-fusedpolycyclicamides.
Synthesis of (−)-(<i>R</i>)-Pyrrolam A and Studies on Its Stability: A Caveat on Computational Methods
作者:Rhett T. Watson、Vinayak K. Gore、Kishan R. Chandupatla、R. Karl Dieter、James P. Snyder
DOI:10.1021/jo049460r
日期:2004.9.1
The asymmetric synthesis of (−)-(R)-pyrrolam A was achieved in three operations from N-Boc pyrrolidine via an α-(N-carbamoyl)alkylcuprate vinylation reaction followed by N-Boc deprotection and cyclization. One-pot deprotection−cyclization procedures led to mixtures of pyrrolam A and its double bond isomers. These isomerization events could be circumvented by use of a two-step procedure. To guide aspects