Effects of nitrogen and alkene substitution on the PtCl2 catalyzed cycloisomerization of N-tethered 1,6-enyne precursors to the triple reuptake inhibitor GSK1360707
The effects of nitrogen and alkene substitution on the cycloisomerization of N-tethered 1,6-enynes into 3-azabicyclo[4.1.0]Theptene precursors to the triple reuptake inhibitor GSK1360707 are described. In general, electron donating substituents proved beneficial both in terms of the reaction rate and chemoselectivity. (C) 2011 Elsevier Ltd. All rights reserved.
Concise Synthesis of the Antidepressive Drug Candidate GSK1360707 by a Highly Enantioselective Gold‐Catalyzed Enyne Cycloisomerization Reaction
作者:Henrik Teller、Alois Fürstner
DOI:10.1002/chem.201101346
日期:2011.7.4
depressing results are obtained from a gold‐catalyzed enyne cycloisomerization controlled by phosphoramidite ligands with TADDOL‐related but acyclic backbones (see scheme; Cbz=benzyloxycarbonyl). The “triple‐reuptake inhibitor” GSK1360707 was obtained in excellent yield and optical purity, therefore highlighting the relevance of asymmetric gold catalysis for practical applications.
Readily available phosphoramidites incorporating TADDOL-related diols with an acyclic backbone turned out to be excellent ligands for asymmetric gold catalysis, allowing a number of mechanistically different transformations to be performed with good to outstanding enantioselectivities. This includes [2 + 2] and [4 + 2] cycloadditions of ene-allenes, cycloisomerizations of enynes, hydroarylation reactions