Chemo- and Diastereoselective Reduction of .beta.-Enamino Esters: A Convenient Synthesis of Both cis- and trans-.gamma.-Amino Alcohols and .beta.-Amino Esters
摘要:
Convenient procedures for the chemo- and diastereoselective reduction of beta-enamino esters 1 are described. Both cis- and trans-gamma-amino alcohols 2 or beta-amino esters 3 can be prepared by reduction of beta-enamino esters 1, readily available starting materials, with the use of inexpensive reagents Nali-PrOH or NaHbB(OAc)(3)/AcOH, respectively, and the appropriate reduction conditions. The mechanisms and diastereoselectivities for the reductions are discussed. The relative configurations and conformations of the diastereoisomeric gamma-amino alcohols 2 and beta-amino esters 3 obtained are established by H-1 and C-13 NMR study and unequivocally set by their cyclic derivatives tetrahydro-1,3-oxazines 4.
Selective formation of α,ω-ester amides from the aminocarbonylation of castor oil derived methyl 10-undecenoate and other unsaturated substrates
作者:Cristina Jiménez-Rodriguez、Angel A. Núñez-Magro、Thomas Seidensticker、Graham R. Eastham、Marc R. L. Furst、David J. Cole-Hamilton
DOI:10.1039/c4cy00158c
日期:——
The reaction of long chain alkenes with CO and aniline in the presence of palladium complexes of 1,2-bis-(ditertbutylphosphinomethyl)benzene produces amides with high linear selectivity, with much higher rates and catalyst stability when 2-naphthol and sodium or potassiumiodide are added. Unsaturated esters including methyl 10-undecenoate from castor oil give α,ω-ester amides, whilst reactions in THF
One-Pot Preparation of Chiral .BETA.-Amino Esters by Rhodium-Catalyzed Three-Components Coupling Reaction.
作者:Toshio Honda、Hitoshi Wakabayashi、Kazuo Kanai
DOI:10.1248/cpb.50.307
日期:——
Chiral beta-amino esters are synthesized in one-pot from three components, amines, aldehydes, and ethyl bromoacetate, under the rhodium-catalyzed Reformatsky-type reaction condition, where complete diastereoselection is achieved in the nucleophilic addition step of ethyl bromoacetate to the imines prepared in
KANO, SHINZO;SHIBUYA, SHIROSHI;EBETA, TSUTOMU, J. CHEM. SOC. PERKIN. TRANS., 1982, N 1, 257-260
作者:KANO, SHINZO、SHIBUYA, SHIROSHI、EBETA, TSUTOMU
DOI:——
日期:——
Chemo- and Diastereoselective Reduction of .beta.-Enamino Esters: A Convenient Synthesis of Both cis- and trans-.gamma.-Amino Alcohols and .beta.-Amino Esters
Convenient procedures for the chemo- and diastereoselective reduction of beta-enamino esters 1 are described. Both cis- and trans-gamma-amino alcohols 2 or beta-amino esters 3 can be prepared by reduction of beta-enamino esters 1, readily available starting materials, with the use of inexpensive reagents Nali-PrOH or NaHbB(OAc)(3)/AcOH, respectively, and the appropriate reduction conditions. The mechanisms and diastereoselectivities for the reductions are discussed. The relative configurations and conformations of the diastereoisomeric gamma-amino alcohols 2 and beta-amino esters 3 obtained are established by H-1 and C-13 NMR study and unequivocally set by their cyclic derivatives tetrahydro-1,3-oxazines 4.
Kano, Shinzo; Shibuya, Shiroshi; Ebata, Tsutomu, Journal of the Chemical Society. Perkin transactions I, 1982, p. 257 - 260