Dihalocyclopropanation of Phenylthio or Butylthiocycloalkenes Under Phase Transfer Conditions. Opening of Cyclopropanes Under Microwave Irradiation
摘要:
Dihalocarbenes (X=Cl,Br) generated under phase transfer conditions added to phenylthio or butylthiocylcloalkenes give corresponding 1,1-dihalo-2-thiobutyl or thiophenyl-cyclopropanes. The ring opening of dichlorophenylthiocyclopropanes (2a, 2b, 2c) was obtained by using silver tetrafluoborate on alumina under microwave irradiation.
Asymmetric [2+2] Cycloaddition Reaction between α,β-Unsaturated Acid Derivatives and Alkynyl or Alkenyl Sulfides Catalyzed by a Chiral Titanium Reagent
作者:Yujiro Hayashi、Koichi Narasaka
DOI:10.1246/cl.1990.1295
日期:1990.8
Asymmetric [2+2] cycloaddition reaction between 3-(acryloyl)-1,3-oxazolidin-2-one derivatives and alkynyl or alkenyl sulfides proceeds by the use of a chiral titanium reagent to give the corresponding cyclobutene or cyclobutane derivatives in high enantioselectivity.
Acylation of Butylthio or Phenylthio Cycloalkenes. Catalysis by Aluminium Exchanged Clay
作者:Didier Villemin、Bouchta Labiad
DOI:10.1080/00397919208021131
日期:1992.12
Abstract Thiobutyl or thiophenylcycloalkenes were acylated by acetyl or benzoyl chloride in the presence of aluminium trichloride. Aluminium exchanged montmorillonite catalysed the reaction and gave a better yield than with a stoechiometric quantity of aluminium trichloride.
In the presence of certain Lewis acids, alkenes containing an alkylthio group (for example, ketene dithioacetals, alkenyl sulfides, alkynyl sulfides, and allenyl sulfides) react with electron deficient olefins to give the corresponding cyclobutane, cyclobutene, or methylene cyclobutane derivatives. By employing a chiral titanium catalyst generated in situ from dichlorodiisopropoxytitanium and a tartrate-derived chiral diol, the [2 + 2] cycloaddition reaction proceeds with high enantioselectivity.
LABIAD, BOUCHTA;VILLEMIN, DIDIER, SYNTHESIS,(1989) N, C. 143-144
作者:LABIAD, BOUCHTA、VILLEMIN, DIDIER
DOI:——
日期:——
Narasaka Koichi, Hayashi Yujiro, Shimadzu Hideshi, Niihata Shigeo, J. Amer. Chem. Soc., 114 (1992) N 23, S 8869-8885