Synthesis of Strained γ-Lactams by Palladium(0)-Catalyzed C(sp<sup>3</sup>
)−H Alkenylation and Application to Alkaloid Synthesis
作者:Philipp M. Holstein、David Dailler、Julien Vantourout、Janah Shaya、Anthony Millet、Olivier Baudoin
DOI:10.1002/anie.201511457
日期:2016.2.18
strained α‐alkylidene‐γ‐lactams were synthesized by palladium(0)‐catalyzed intramolecular C(sp3)−H alkenylation from easily accessible acyclic and monocyclic bromoalkene precursors. These lactams are valuable intermediates for accessing various classes of mono‐ and bicylic alkaloids containing a pyrrolidine ring, as illustrated with the synthesis of an advanced model of the marine natural product plakoridine A
1,4-Palladium Shift/C(sp<sup>3</sup>)–H Activation Strategy for the Remote Construction of Five-Membered Rings
作者:Ronan Rocaboy、Olivier Baudoin
DOI:10.1021/acs.orglett.9b00187
日期:2019.3.1
functionalization of remote C–H bonds from simple precursors. In this work, we report a novel and simple Pd0-catalyzed domino reactioninvolving 1,4-palladium shift and C(sp3)–H activation and leading to (fused) five-membered rings. This method allowed access to a broad range of valuable arylidene γ-lactams and indanones and was applied to the formalsynthesis of (−)-pyrrolam.
A Dearomatizing, Thionium Ion Cyclization for the Synthesis of Functionalized, Azaspirocyclic Cyclohexadienones
作者:Caroline Ovens、Nathaniel G. Martin、David J. Procter
DOI:10.1021/ol8002095
日期:2008.4.1
Thionium ions, generated by the addition of thiols to N-benzylglyoxamides, undergo a dearomatizing spirocyclization. The alkyl or arylsultanyl group introduced during the thionium ion cyclization can act as a synthetic handle and a stereochemical control element during modifications of the azaspirocyclic frameworks (R(F) = CH(2)CH(2)C(8)F(17)).