Rhodium-Catalyzed Regioselective Domino Azlactone-Alkyne Coupling/Aza-Cope Rearrangement: Facile Access to 2-Allyl-3-oxazolin-5-ones and Trisubstituted Pyridines
作者:Jinqiang Kuang、Shaista Parveen、Bernhard Breit
DOI:10.1002/anie.201704022
日期:2017.7.10
Rhodium‐catalyzedregioselective addition of azlactones to internal alkynes combined with aza‐Cope rearrangement provides efficient atom economic access to 2‐allyl‐3‐oxazolin‐5‐one derivatives. Extension to a triple domino process, in which the above process is combined with in situ azlactone formation starting from amino acids renders this process even more attractive. Subsequent thermolysis of the
Controlled Single and Double Iodofluorination of Alkynes with DIH- and HF-Based Reagents
作者:Lukas Pfeifer、Véronique Gouverneur
DOI:10.1021/acs.orglett.8b00321
日期:2018.3.16
terminal alkynes using 1,3-diiodo-5,5,-dimethylhydantoin and HF-based reagents is disclosed. This approach is used to prepare a fluorinated tamoxifen derivative in two steps from commercially available starting materials. A facile method enabling controlled regioselective double iodofluorination of terminal alkynes is also presented.
Simultaneous and Stereoselective Construction of Planar and Axial Centers of Chirality
作者:Louis Fogel、Richard P. Hsung、William D. Wulff、Roger D. Sommer、Arnold L. Rheingold
DOI:10.1021/ja010091f
日期:2001.6.1
all of these alkynes, the reaction products could be completely isomerized to the anti isomer by performing the reaction at 120 °C except for the smaller ortho methoxyl complex which only required 50 °C for complete conversion. This includes the very hindered tertbutyl complex3i which was formed as a slightly preferred kinetic product having the syn stereochemistry which was determined by X-ray diffraction
Rhodium-Catalyzed Intermolecular Carbonylative [2 + 2 + 1] Cycloaddition of Alkynes Using Alcohol as the Carbon Monoxide Source for the Formation of Cyclopentenones
作者:Ju Hyun Kim、Taemoon Song、Young Keun Chung
DOI:10.1021/acs.orglett.7b00458
日期:2017.3.3
regioselective rhodium-catalyzed intermolecular carbonylative [2 + 2 + 1] cycloaddition of alkynes using alcohol as a CO surrogate to access 4-methylene-2-cyclopenten-1-ones has been developed. In this transformation, the alcohol performs multiple roles, including generating the Rh–H intermediate, functioning as the CO source, and assisting in the isomerization of the alkyne. Alkynes can act as both the olefin
Highly regioselective nitrile oxide dipolar cycloadditions with ortho-nitrophenyl alkynes
作者:Melissa L. McIntosh、Michael R. Naffziger、Bradley O. Ashburn、Lev N. Zakharov、Rich G. Carter
DOI:10.1039/c2ob26267c
日期:——
The dipolar cycloadditions of ortho-nitrophenyl alkynes with aryl nitrileoxides has been demonstrated. A range of substituents are tolerated on the alkyne. These reactions proceed with excellent levels of regioselectivity. Subsequent functionalization of the isoxazole scaffold has been demonstrated.