Synthesis of thioimidates by insertion of TerT-butylisocyanide into the C-S bond of activated sulfides. Rearrangement of thioimidates by 1,3 C to N migration of an alkoxycarbonyl group
作者:G Morel、E Marchand、K.H Nguyen Thi、A Foucaud
DOI:10.1016/s0040-4020(01)91248-7
日期:1984.1
thioimidates can also be obtained via the chlorine substitution of the tert-butylimino chloro sulfides -, which is a more general method. These thioimidates rearrange to E and Z isomers of N-vinylcarbamates - via a 1,3 C to N migration of the alkoxycarbonyl group.
mild, reagent-cyanide-free, and efficient synthesis of O-phosphinoyl-protected cyanohydrins from readily available α-substituted malononitriles was realized using diarylphosphine oxides in the presence of O2. Mechanistic studies indicated that in addition to the initial aerobic oxidation of the malononitrile derivative notable features of this process include the formation of a tetrahedral intermediate
Cinchona Alkaloid Squaramide-Catalyzed Asymmetric Michael Addition of α-Aryl Isocyanoacetates to β-Trifluoromethylated Enones and Its Applications in the Synthesis of Chiral β-Trifluoromethylated Pyrrolines
作者:Mei-Xin Zhao、Hui-Kai Zhu、Tong-Lei Dai、Min Shi
DOI:10.1021/acs.joc.5b01829
日期:2015.11.20
biologically attractive chiral β-trifluoromethylated pyrroline carboxylate in high yield via an isocyano group hydrolysis/cyclization/dehydration cascade reaction by treating with acid. The one-pot enantioselectiveMichaeladdition/isocyano group hydrolysis/cyclization/dehydration sequential protocol has also been investigated.
<i>Cinchona</i>Alkaloid-Derived Thiourea-Catalyzed Diastereo- and Enantioselective [3+2] Cycloaddition Reaction of Isocyanoacetates to Isatins: A Facile Access to Optically Active Spirooxindole Oxazolines
作者:Mei-Xin Zhao、Hao Zhou、Wen-Hao Tang、Wei-Song Qu、Min Shi
DOI:10.1002/adsc.201300077
日期:2013.5.3
An efficient diastereo‐ and enantioselective [3+2] cycloaddition reaction of α‐aryl isocyanoacetates to isatins catalyzed by a quinine‐derived bifunctional amine‐thiourea‐bearing sulfonamide as multiple hydrogen‐bonding donor catalyst has been investigated. The corresponding adducts, which bear a spirocyclic quaternary stereocenter at the C‐3 position of the oxindole, were obtained in good yields (51–95%)
A nickel‐catalyzed asymmetric oxazole‐forming Ugi reaction of C,N‐cyclic azomethine imines and isonitriles is disclosed. The reported protocol proceeds smoothly, and gives the corresponding adducts, which contain two important pharmaceutically active ring‐systems (tetrahydroquinoline and oxazole rings), in good yields and excellent enantioselectivities by employing an easily accessible chiral diamine