Copper Catalyzed Asymmetric Synthesis of Chiral Allylic Esters
作者:Koen Geurts、Stephen P. Fletcher、Ben L. Feringa
DOI:10.1021/ja065780b
日期:2006.12.1
reagents to 3-bromopropenyl esters 1 to provide allylic esters 2 in high yields and high chemio-, regio-, and enantioselectivities. The work demonstrates that allylic asymmetric alkylation (AAA) can be done on substrates bearing a heteroatom at the gamma-position. The method is a practical route to chiral, nonracemic allylicalcohols. The use of functionalized substrates 1 or Grignard reagents leads to
Chemistry of baker's yeast reduction products: Use of optically active (S)-(+)-1-(p-toluenesulfonyl)propan-2-ol and (S)-(+)-1-(phenylsulfonyl)propan-2-ol in synthesis.
作者:Alan P. Kozikowski、B.B. Mugrage、C.S. Li、L. Felder
DOI:10.1016/s0040-4039(00)85071-6
日期:1986.1
The utility of the title compounds in the preparation of opticallyactive lactones and alcohols is detailed.
详细说明了标题化合物在制备光学活性内酯和醇中的用途。
Kinetic Resolution of Racemic Lactones by Conjugate Additions of Allylic Organolithium Species: Direct Formation of Three Contiguous Centers with High Diastereo- and Enantioselectivities
作者:Sung H. Lim、Peter Beak
DOI:10.1021/ol0263898
日期:2002.8.1
[reaction: see text] Kinetic resolution of racemic alpha,beta-unsaturated lactones by the organolithium species produced from asymmetric lithiation of N-Boc-N-(p-methoxyphenyl)cinnamylamine provides conjugateaddition products with three contiguous stereogenic centers in yields of 62-77% with diastereomeric ratios from 75:25 to >99:1 and enantiomeric ratios for the major diastereomers from 94:6 to 98:2
Asymmetric Synthesis of 5-Substituted γ-Lactones and Butenolides via Nucleophilic Additions to Oxycarbenium Ions Derived from 5(<i>R</i>)-(Menthyloxy)-4(<i>R</i>)- (phenylsulfanyl)-2(3<i>H</i>)-dihydrofuranone
作者:Arjan van Oeveren、Ben L. Feringa
DOI:10.1021/jo960078r
日期:1996.1.1
A sulfur-containing diselenide as an efficient chiral reagent in asymmetric selenocyclization reactions
Treatment of the di-2-[(IS)-1-(methylthio)ethyl]phenyl diselenide with bromine and silver triflate afforded the corresponding selenyl triflate which was used in situ as a strongly electrophilic selenium reagent to effect the asymmetric synthesis of oxygen- or nitrogen-containing heterocycles. Cyclic ethers, lactones, lactams or N-protected pyrrolidines have been prepared in good yield with complete regioselectivity and high diastereoselectivity. (C) 2001 Elsevier Science Ltd. All rights reserved.