Enantioselective Synthesis of a PKC Inhibitor via Catalytic C−H Bond Activation
摘要:
The syntheses of two biologically active molecules possessing dihydropyrroloindole cores (1 and 2) were completed using rhodium-catalyzed imine-directed CA bond functionalization, with the second of these molecules containing a stereocenter that can be set with 90% ee during cyclization using chiral nonracemic phosphoramidite ligands. Catalytic decarbonylation and direct indole/maleimide coupling provide efficient access to 2.
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.
Pd-Catalyzed Highly Regio- and Stereoselective Formation of C–C Double Bonds: An Efficient Method for the Synthesis of Benzofuran-, Dihydrobenzofuran-, and Indoline-Containing Alkenes
A highly regio- and stereoselective C–C double bond formation reactionvia Pd-catalyzed Heck-type cascade process with N-tosylhydrazones has been developed. Various N-tosylhydrazones derived from both ketones and aldehydes are found to be efficient substrates to provide di- and trisubstitutedolefins with high regio- and stereoselectivity. Furthermore, this reaction has a good functional group tolerance
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
Sulfoximine-Assisted One-Pot Unsymmetrical Multiple Annulation of Arenes: A Combined Experimental and Computational Study
作者:Koushik Ghosh、Majji Shankar、Raja K. Rit、Gurudutt Dubey、Prasad V. Bharatam、Akhila K. Sahoo
DOI:10.1021/acs.joc.8b01077
日期:2018.9.7
presence of Ru catalyst forming two C–C and one C–N bonds in a single operation. The overall process is atom economical and step-efficient and provides unusual dihydrofuran-fused isoquinolone heterocycles. Further annulation of NH and the proximal o-C–H-arene of isoquinolone with alkynes build highly conjugated novel polycyclic compounds. Overall, three independent annulations in arene motifs are visualized
Chiral Cp-Rhodium(III)-Catalyzed Asymmetric Hydroarylations of 1,1-Disubstituted Alkenes
作者:Baihua Ye、Pavel A. Donets、Nicolai Cramer
DOI:10.1002/anie.201309207
日期:2014.1.7
Metal‐catalyzedfunctionalizations at the ortho position of a directing group have become an efficient bond‐forming strategy. A wide range of transformations that employ Cp*RhIII catalysts have been described, but despite their synthetic potential, enantioselective variants that use chiral versions of the Cp* ligand remain scarce (Cp*=pentamethyl cyclopentadienyl). Cyclopentadienyl compounds with an