The synthesis of compounds related to the indole–indoline core of the vinca alkaloids (+)-vinblastine and (+)-vincristine
作者:Michael J. Harvey、Martin G. Banwell、David W. Lupton
DOI:10.1016/j.tetlet.2008.05.082
日期:2008.8
for introducing the aromatic residue. Subjection of these compounds to Johnson iodination and Pd[0]-catalyzed Ullmann cross-coupling of the resulting α-iodocycloalkenones 11 with 2-iodonitrobenzene (5, X = I) then affords α,α′-diaryl-α′-carbomethoxycycloalk-2-en-1-ones of the general form 10. Reductive cyclization of this last type of compound gives the corresponding indoles 9a–f (n = 1–3), some of which
Enantioselective Synthesis of α-Allyl-α-aryldihydrocoumarins and 3-Isochromanones via Pd-Catalyzed Decarboxylative Asymmetric Allylic Alkylation
作者:Ramulu Akula、Patrick J. Guiry
DOI:10.1021/acs.orglett.6b02584
日期:2016.11.4
An enantioselectivePd-catalyzed DAAA of α-aryl-β-oxo esters has been developed employing the (R,R)-ANDEN-phenyl Trost ligand to prepare a series of α-aryl-α-allyldihydrocoumarins and 3-isochromanones. A variety of aryl groups were successfully employed to afford the dihydrocoumarin and 3-isochromanone products in high yields up to 95% and ee’s up to 96%. Under these conditions, substrates containing
Enantioselective Synthesis of Sterically Hindered Tertiary α-Aryl Oxindoles via Palladium-Catalyzed Decarboxylative Protonation. An Experimental and Theoretical Mechanistic Investigation
作者:Maria Biosca、Mark Jackson、Marc Magre、Oscar Pàmies、Per-Ola Norrby、Montserrat Diéguez、Patrick J. Guiry
DOI:10.1002/adsc.201800507
日期:2018.8.17
We have developed the first catalytic asymmetric preparation of sterically hindered tertiary α‐aryl oxindoles via enantioselective palladium‐catalyzed decarboxylative protonation of the corresponding α‐aryl‐β‐amido allylesters. The reaction occurs under very mild conditions and in short reaction times, providing excellent yields and promising enantioselectivities (ee's up to 78%). We have also performed
Enantioselective Synthesis of Sterically Hindered α‐Allyl‐α‐Aryl Lactams via Palladium‐Catalysed Decarboxylative Asymmetric Allylic Alkylation
作者:Declan J. Galvin、Patrick J. Guiry
DOI:10.1002/ejoc.202400314
日期:2024.6.17
The Pd-catalysed decarboxylative asymmetric allylicalkylation (DAAA) of sterically hindered α-aryl,β-amido allyl ester lactams has been developed. The key step in the synthesis of a range of α-aryl lactam substrates for catalysis was a Pb-mediated α-arylation. A substrate scope of 11 examples of DAAA showed that products containing the di-ortho-methoxy-substituted phenyls and naphthyl groups gave