Conjugate Addition of Mixed Diorganozinc Compounds and Functionalized Organozinc Cuprates to Nitroolefins
作者:Audrius Rimkus、Norbert Sewald
DOI:10.1021/ol026557w
日期:2002.9.1
conjugate addition of symmetrical and mixed diorganozinc compounds as well as functionalized diorganozinc cuprates to nitroolefins leads to synthetically versatile nitro compounds in moderate to good yields. Mixed TMSM-organozinc compounds are suitable reagents for conjugate addition, since the TMSM group is not being transferred. Ipso substitution is observed in the absence of a catalytic amount of
Palladium(II)-Catalyzed Michael-Type Hydroarylation of Nitroalkenes Using Aryltins and Sodium Tetraarylborates
作者:Toshiyuki Ohe、Sakae Uemura
DOI:10.1246/bcsj.76.1423
日期:2003.7
variety of aryltin compounds and sodium tetraarylborates can be employed for Michael-type hydroarylation reactions of nitroalkenes to afford β-arylnitroalkanes in moderate to good yields in the presence of either LiCl, MgCl2, or CaCl2 and a catalytic amount of palladium(II) salt (0.05 molar amount) in acetic acid. Results show that 50–70% of aryl groups out of all in these arylcompounds can be transferred
A novel catalytic activity of bismuth(III) salts in palladium(II)-catalyzed atom economical Michael-type hydroarylation of nitroalkenes with aryltin compounds
作者:Toshiyuki Ohe、Sakae Uemura
DOI:10.1016/s0040-4039(01)02387-5
日期:2002.2
A novel catalytic effect of bismuth(III) salts such as BiCl3, Bi2O3, and Bi(NO3)(3).5H(2)O has been disclosed in new palladium(II)-catalyzed Michael-type hydroarylation of nitroalkenes with aryltin compounds. The reaction is atom economical in the tin compounds and slightly fewer than four aryl groups of tetraaryltins can be transferred to the produces. (C) 2002 Elsevier Science Ltd. All rights reserved.
Conjugate Addition of Organozinc Compounds to Nitroolefins
作者:Norbert Sewald、Audrius Rimkus
DOI:10.1055/s-2003-44355
日期:——
excellent yield and enantioselectivity. The products can easily be transformed into beta(2)-homoamino acids, compounds of high relevance for different areas of preparative organic chemistry. 1 Introduction 2 Synthesis of Nitroolefins 3 ConjugateAddition of Organozinc Compounds 3.1 ConjugateAddition of Functionalized Organozinc Cuprates and Diorganozine Compounds 3.2 ConjugateAddition of Alkyl Trimethylsilylmethylzinc