A Nitrone Dipolar Cycloaddition Strategy toward an Enantioselective Synthesis of Massadine
作者:Jeffrey S. Cannon
DOI:10.1021/acs.orglett.8b01464
日期:2018.7.6
of the massadine D-ring by a synthetic route that features a diastereoselective and stereospecific Ireland–Claisen rearrangement of a trianionic enolate followed by a diastereoselective nitrone dipolar cycloaddition of a highly electron-poor oxime.
An Enantioselective Formal Synthesis of (+)-Lactacystin from Hydroxymethyl Glutamic Acid (HMG)
作者:Christopher Hayes、Abdul Hameed、Alexander Blake
DOI:10.1055/s-0029-1219207
日期:2010.3
A formal synthesis of (+)-lactacystin from hydroxymethylglutamic acid (HMG), with an alkylidene carbene insertion reaction being used to construct the key nitrogen-bearing quaternary centre has been completed. Our route intercepts that of Shibasaki at an advanced pyrrolidinone intermediate, from which the synthesis can be completed following Donohoe's route.
A Second Generation Formal Synthesis of (−)-Cephalotaxine
作者:Abdul Hameed、Alexander J. Blake、Christopher J. Hayes
DOI:10.1021/jo801540q
日期:2008.10.17
A second generation formal synthesis of the alkaloid (-)-cephalotaxine has been achieved using an alkylidene carbene 1,5-CH insertion reaction to establish a key quaternary stereocenter. The carbene precursor was readily derived from L-proline, and the 1,5-CH insertion reaction was performed under Ohira's conditions using lithiotrimethylsilyldiazomethane (LTDM), which gave the desired spirocyclic product
Enantioselective Synthesis of the Excitatory Amino Acid (1<i>S,</i>3<i>R</i>)-1-Aminocyclopentane-1,3-dicarboxylic Acid
作者:Daniel M. Bradley、Renameditswe Mapitse、Nicholas M. Thomson、Christopher J. Hayes
DOI:10.1021/jo025892v
日期:2002.11.1
synthesis of the alpha,alpha-dialkyl-alpha-amino acid (1S,3R)-ACPD has been achieved using an alkylidene carbene 1,5-CH insertion reaction as a key step. The ketone cyclization precursor was synthesized from Garner's aldehyde in high yield via a Wittig homologation and subsequent catalytic hydrogenation. Treatment of the ketone with 1.2 equiv of lithio(trimethylsilyl)diazomethane in THF resulted in