The site-selective thio-allylation of electron-deficient 1,2-dienes is documented under scandium catalysis.
该网站选择性地记录了在钪催化下对电子不足的1,2-二烯烃进行硫烯基化。
Asymmetric Diels–Alder reactions of N-allenoyloxazolidinones catalyzed by Cu(II)–bis(oxazoline) complexes
作者:Torsak Luanphaisarnnont
DOI:10.1016/j.tetlet.2014.10.051
日期:2014.12
Catalytic asymmetric Diels–Alder reactions of N-allenoyloxazolidinones were investigated. Various chiral metal–bis(oxazoline) and metal–pyridinebis(oxazoline) complexes were screened. Cu(SbF6)2(H2O)2(t-BuBox) was found to be the most effective catalyst, giving the product in high yield, enantioselectivity, and endo:exo selectivity. The relative reactivity between N-allenoyloxazolidinones and N-alkenoyloxazolidinones
chemodivergent [4 + 1] and [3 + 3] annulations of allenyl imides and β,γ-enones have been developed, furnishing highly substituted 2-cyclopentenone and 2-pyranone derivatives in moderate to excellent yields. Two plausible reaction mechanisms involving two different ketene intermediates have been proposed to explain the observed chemoselectivity. Moreover, by virtue of the α,β-enone substructure of the [4 + 1]
Intermolecular [2 + 2] Cycloaddition/Isomerization of Allenyl Imides and Unactivated Imines for the Synthesis of 1-Azadienes Catalyzed by a Ni(ClO<sub>4</sub>)<sub>2</sub>·6H<sub>2</sub>O Lewis Acid
The intermolecular [2 + 2] cycloaddition/isomerization between allenyl imides and N-(2-methoxyphenyl) aldimine counterparts catalyzed by a Ni(ClO4)2·6H2O Lewisacid at room temperature was discovered, providing a facile access to 1-azadiene derivatives with high atom economy. The incorporation of an 2-oxazolidinone group into allene amides resulted in unusual reactivity for the imine-metathesis and
An efficient catalytic asymmetric [2+2] cycloadditionreaction of allenyl imide and alkenes was achieved by utilizing chiral N,N′-dioxide-magnesium(II) complex as the catalyst. This protocol provided a series of axially chiral cyclobutenes in high yields with excellent enantioselectivities. A stepwise mechanism was proposed based on experimental studies and DFT calculations and π–π stacking interaction