Iron-Catalyzed Aerobic Oxidation and Annulation Reaction of Pyridine and α-Substituted Allenoate toward Functionalized Indolizine
作者:Tao Jin、Zhongzhong Tang、Jie Hu、Hongdong Yuan、Yaoyao Chen、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.orglett.7b03696
日期:2018.1.19
An iron-catalyzed reaction of pyridine and α-substituted allenoate has been disclosed. The present strategy incorporates the aerobic oxidation into annulation involving substituted allenoate, thus providing a new access to functionalized indolizine.
Synthesis of Substituted Coumarins via Brønsted Acid Mediated Condensation of Allenes with Substituted Phenols or Anisoles
作者:Sundae Kim、Dongjin Kang、Chang-Hee Lee、Phil Ho Lee
DOI:10.1021/jo301086k
日期:2012.8.3
Coumarins were obtained from the condensation of electron-rich arenes with allenes in the presence of TfOH in good yield. Depending on the substituent pattern of allenes employed, the general synthetic method of 4-substituted and 3,4-disubstituted 3-arylcoumarins has been developed. Readily available allenes were employed as the three-carbon atom sources constituting the coumarin skeleton.
Studies on Electrophilic Interaction of 2,3-Allenols with Electrophilic Halogen Reagents: Selective Synthesis of 2,5-Dihydrofurans, 3-Halo-3-alkenals, or 2-Halo-2-alkenyl Ketones
作者:Jing Li、Chunling Fu、Guofei Chen、Guobi Chai、Shengming Ma
DOI:10.1002/adsc.200800088
日期:2008.6.9
iodine (I2) afforded 2,5-dihydrofurans while that of readily available 1-aryl or 1-methyl substituted 2,3-allenols with bromine (Br2), N-bromosuccinimide (NBS), I2 or N-iodosuccinimide (NIS) formed the not easily available but synthetically useful 3-halo-3-alkenals and 2-halo-2-alkenyl ketones with good selectivity and yields via a sequential electrophilic interaction of X+ with the allene moiety, 1,2-aryl
Chiral Allenes via Alkynylogous Mukaiyama Aldol Reaction
作者:Aurélien Tap、Aurélie Blond、Vijay N. Wakchaure、Benjamin List
DOI:10.1002/anie.201603649
日期:2016.7.25
development of a catalyticenantioselective alkynylogous Mukaiyamaaldolreaction. The reaction is catalyzed by a newly designed chiral disulfonimide and delivers chiral allenoates in high yields and with excellent regio‐, diastereo‐, and enantioselectivity. Our process tolerates a broad range of aldehydes in combination with diverse alkynyl‐substituted ketene acetals. The reaction products can be readily
A triphenylphosphine-promoted [3+2] cycloaddition of α,γ-bis-substituted allenoates and N-tosylaldimines followed by alkene isomerization was disclosed, affording a series of functionalized 2-pyrroline derivatives in moderate chemical yields with random diastereoselectivities.