Reactions between acyclic (E)-allylic acetates and arylboronic acids in the presence of a palladium catalyst prepared from Pd(OAc)(2), phenanthroline (or bipyridine), and AgSbF(6) (1:1.2:1) proceeded with excellent gamma-selectivity to afford allyl-aryl coupling products with E-configuration. The reactions of alpha-chiral allylic acetates took place with excellent alpha-to-gamma chirality transfer
On the utility of α-heteroatom substituted orthoesters in the Johnson Claisen rearrangement
作者:Todd R. Elworthy、David J. Morgans、Wylie S. Palmer、David B. Repke、David B. Smith、Ann Marie Waltos
DOI:10.1016/s0040-4039(00)73290-4
日期:1994.7
α-Heteroatom substituted orthoesters were prepared and found to undergo the Johnson Claisen rearrangement with a variety of allylicalcohols giving γ,δ-unsaturated α-heteroatom substitutedesters in fair to excellent yields. The diastereoselectivity of the process was examined.
Sulfonamidoquinoline/Palladium(II)-Dimer Complex As a Catalyst Precursor for Palladium-Catalyzed γ-Selective and Stereospecific Allyl-Aryl Coupling Reaction between Allylic Acetates and Arylboronic Acids
作者:Yusuke Makida、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1002/asia.201000721
日期:2011.2.1
On neutral territory: A neutral palladium(II)‐dimer catalyst system incorporating anionic sulfonamidoquinoline ligands is effective for the γ‐selective and stereospecific allyl–aryl coupling between acyclic (E)‐allylic acetates and arylboronic acids.
readily react with ethereal H2O2 in the presence of catalytic amounts of Na2MoO4-gly or MoO2(acac)2, affording the C═C trans hydroxylation–hydroperoxylation products in good yields with high regio- and stereoselectivity. Use of enantiomers of cyclic substrates resulted in corresponding enantiopure diol-tert-hydroperoxides. The possibility of further conversion of the diol-tert-hydroperoxides into triols
在催化量的Na 2 MoO 4 -gly或MoO 2(acac)2的存在下,一系列烯丙醇易于与醚H 2 O 2反应,从而以高收率提供C═C反羟基化-氢过氧化产物具有高区域选择性和立体选择性。使用环状底物的对映异构体产生相应的对映体纯的二醇-叔氢过氧化物。还举例说明了将二醇-叔氢过氧化物进一步转化为具有包含季中心的分离的叔-过氧基团的三醇或线性结构单元的可能性。
Conversion of Allylic Alcohols to Stereodefined Trisubstituted Alkenes: A Complementary Process to the Claisen Rearrangement
作者:Justin K. Belardi、Glenn C. Micalizio
DOI:10.1021/ja8074242
日期:2008.12.17
A stereoselective method for the conversion of allylic alcohols to (Z)-trisubstituted alkenes is presented. Overall, the reaction sequence described is stereochemically complementary to related Claisen rearrangement reactions--processes that typically deliver the stereoisomeric trisubstitutedalkene containing products.