Toward the improvement of the tandem halide displacement/amide coupling spiro-cyclization as a new route to γ-lactam and pyrroloisoquinoline templates
作者:Iyad Allous、Sébastien Comesse、Dušan Berkeš、Amar Alkyat、Adam Daïch
DOI:10.1016/j.tetlet.2009.02.114
日期:2009.8
Two efficient and rapid accesses to spiro-oxindole entities bearing an imide function were presented, and their performance was compared. The key components are N-substituted alpha-bromoacetamides to reach these derivatives in tandem process. The resulting spiro-imides from these methodologies were regioselectively reduced into corresponding N-acyliminium precursors, which were subsequently submitted to an intramolecular cyclization to provide pentacyclic spiro-oxindole architecture analogues to pteropodine and spirotryprostatin-B alkaloids with high diastereoselective control. (C) 2009 Elsevier Ltd. All rights reserved.