Allyl-aryl coupling between allylic acetates and arylboronicacids took place in the presence of catalytic amounts of Pd(OAc)(2), 1,10-phenanthroline, and AgSbF(6) with high gamma-selectivity and E/Z-selectivity. The reaction of an optically active allylic acetates with an alpha-stereogenic center proceeded with excellent alpha-to-gamma chirality transfer with syn-selectivity and gave the corresponding
Studies on Chirality Transfer in the [2,3] Sigmatropic Rearrangement of Anions Derived from Trialkylstannylmethyl Allylic Ethers. Stereospecific Synthesis of (2R)-3-Benzyloxy-2-methylpropanol.
作者:M.Mark Midland、Young C. Kwon
DOI:10.1016/s0040-4039(01)80840-6
日期:1985.1
Virtually complete chirality transfer is observed in the [2,3] sigmatropicrearrangement of the anion derivedfrom trialkylstanylmethyl ()- or ()-allylic ethers.
Reversible 1,3-<i>anti</i>/<i>syn</i>-Stereochemical Courses in Copper-Catalyzed γ-Selective Allyl–Alkyl Coupling between Chiral Allylic Phosphates and Alkylboranes
The stereochemical courses of the copper-catalyzed allyl-alkyl coupling between enantioenriched chiral allylic phosphates and alkylboranes were switchable between 1,3-anti and 1,3-syn selectivities by the choice of solvents and achiral alkoxide bases with different steric demands. The reactions with gamma-silylated allylic phosphates allow efficient synthesis of enantioenriched chiral allylsilanes with tertiary or quaternary carbon stereogenic centers. Cyclic and acyclic bimodal participation of alkoxyborane species in an organocopper addition-elimination sequence is proposed to account for the phenomenon of the anti/syn-stereochemical reversal.
Application of [2,3] sigmatropic (Wittig) rearrangements in synthesis. The synthesis of (+)-Prelog-Djerassi lactone
作者:David J. S. Tsai、M. Mark Midland
DOI:10.1021/ja00299a026
日期:1985.6
Regio- and Stereocontrolled Introduction of Secondary Alkyl Groups to Electron-Deficient Arenes through Copper-Catalyzed Allylic Alkylation
作者:Yusuke Makida、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1002/anie.201200809
日期:2012.4.23
Copper‐catalyzed allylicalkylation of azoles, a pyridine N‐oxide, and fluoroarenes with secondaryallylic phosphates proceeded under mild reaction conditions with excellent γ‐E‐selectivity. The reactions with enantioenriched allylic phosphates proceeded with 1,3‐anti stereoselectivity to generate an allylic stereogenic center at the position α to the aromatic ring.