Low‐Temperature Intramolecular [4+2] Cycloaddition of Allenes with Arenes for the Synthesis of Diene Ligands
作者:Durga Prasad Hari、Guillaume Pisella、Matthew D. Wodrich、Artem V. Tsymbal、Farzaneh Fadaei Tirani、Rosario Scopelliti、Jerome Waser
DOI:10.1002/anie.202012299
日期:2021.3
The intramolecular [4+2] cycloaddition between arenes and allenes first reported by Himbert gives rapid access to rigid polycyclic scaffolds. Herein, we report a one‐pot oxyalkynylation/cycloaddition reaction proceeding under mild conditions (23–90 °C) and providing complex polycyclic architectures with high efficiency, and atom and step economy. The bicyclo[2.2.2]octadiene products were obtained with
Two Distinct Ag(I)- and Au(I)-Catalyzed Olefinations between α-Diazo Esters and <i>N</i>-Boc-Derived Imines
作者:Rahul Dadabhau Kardile、Rai-Shung Liu
DOI:10.1021/acs.orglett.9b02343
日期:2019.8.16
Metal-catalyzed reactions between α-diazo esters and imines were well-known to yield aziridine derivatives exclusively. This work reports two newolefinationreactions between N-Boc-derived (Boc = tert-Butyloxycarbonyl) imines and α-diazo esters with Ag(I) and Au(I) catalysts, respectively. Our mechanistic studies reveal that these newolefinations involve an initial attack of diazo esters on metal/imine
Iridium(<scp>iii</scp>)-bis(imidazolinyl)phenyl catalysts for enantioselective C–H functionalization with ethyl diazoacetate
作者:N. Mace Weldy、A. G. Schafer、C. P. Owens、C. J. Herting、A. Varela-Alvarez、S. Chen、Z. Niemeyer、D. G. Musaev、M. S. Sigman、H. M. L. Davies、S. B. Blakey
DOI:10.1039/c6sc00190d
日期:——
the interplay of experimental and computational insights. The reaction is tolerant of a variety of diazoacetate precursors and is found to be heavily influenced by the steric and electronic properties of the substrate. Phthalan and dihydrofuran derivatives are functionalized in good yields and excellent enantioselectivities.
据报道,使用基于实验和计算见解的相互作用而开发的新型 Ir( III )-双(咪唑啉基)苯基催化剂家族,仅接受受体的金属碳烯进行分子间对映选择性 C-H 官能化。该反应能够耐受多种重氮乙酸盐前体,并且发现该反应很大程度上受到底物的空间和电子性质的影响。苯并呋喃和二氢呋喃衍生物以良好的收率和优异的对映选择性进行官能化。
Au(I) and HOTf‐Catalyzed Cascade [5+1]‐Annulations between Allenylacetals and Diazo Esters To Form 1,3‐ and 2,3‐Disubstituted Naphthoates, Respectively
作者:Satish Bhausaheb Dawange、Rai‐Shung Liu
DOI:10.1002/adsc.202300605
日期:2023.11.21
Gold-catalyzed [5+1]-annulations between allenylacetals with diazo esters to form 1,3-disubstituted naphthoate derivatives are described. Notably, this reaction chemoselectivity is switched to 2,3-naphthoate products when using the HOTf catalyst. Mechanistic studies of these reactions support an acetal activation, in which oxoniums are formed initially, followed by attack of the allene, generating
N-Heterocyclic Carbene-Catalyzed Ireland–Coates Claisen Rearrangement: Synthesis of Functionalized β-Lactones
作者:Lisa Candish、David W. Lupton
DOI:10.1021/ja310449k
日期:2013.1.9
The N-heterocyclic carbene (NHC)-catalyzed Claisen rearrangement of hybrid Ireland-Coates structures has been achieved, allowing the stereoselective synthesis of highly functionalized beta-lactones. The reaction proceeds with high diastereoselectivity (>20:1) and affords a diverse range of beta-lactone fused cyclopentanes. Mechanistic studies are detailed.