Cascade Synthesis of (<i>E</i>)-2-Alkylidenecyclobutanols
作者:J. R. Falck、Anish Bandyopadhyay、Narender Puli、Abhijit Kundu、L. Manmohan Reddy、Deb K. Barma、Anyu He、Hongming Zhang、Dhurke Kashinath、Rachid Baati
DOI:10.1021/ol901985c
日期:2009.10.15
A facile, one-pot reaction cascade condenses 1,1,1-trichloroalkanes with alpha,beta-unsaturated ketones to unexpectedly furnish moderate to good yields of (E)-2-alkylidenecyclobutanols.
Lewis Acid-Catalyzed Hydrometalation and Carbometalation of Unactivated Alkynes
作者:Naoki Asao、Yoshinori Yamamoto
DOI:10.1246/bcsj.73.1071
日期:2000.5
carbostannation of unactivatedalkynes with organosilanes, or organostannanes proceed effectively in the presence of catalytic amounts of Lewis acids to produce the corresponding vinylsilyl or vinylstannyl compounds in a highly regio- and stereoselective way. Although it is well known that transition metal catalyzed hydrometalations and carbometalations, in general, proceed in a cis-manner, the Lewis acid-catalyzed
Intramolecular Conjugate Additions with Heterocyclic Olefins
作者:Kenneth N. Boblak、Makafui Gasonoo、Yiliang Zhang、Douglas A. Klumpp
DOI:10.1021/acs.joc.5b01701
日期:2015.12.18
been studied. In triflic acid-promoted reactions, conjugate addition is observed with pyrazine-, 2-pyrimidine-, and 2-quinoxaline-based olefins and a phenyl group nucleophile. Markovnikov addition is observed with pyridine and 5-quinoxaline-based olefins. These results are in accordance with previous observations relating the type of addition—conjugate or Markovnikov—to the positions of olefinic substituents