2008
DOI: 10.1039/b803449d
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Stereoselective synthesis of (Z)-α-haloacrylic acid derivatives, and (Z)-haloallylic alcohols from aldehydes and trihaloesters or amides promoted by Rieke manganese

Abstract: A Mn*-promoted sequential process directed toward the synthesis of (Z)-alpha-halo-alpha,beta-unsaturated esters or amides is described. In both cases, the process takes place with complete Z-stereoselectivity. In addition, (Z)-alpha-chloro-alpha,beta-unsaturated ketones and carboxylic acids, and (Z)-haloallylic alcohols were readily prepared from (Z)-alpha-halo-alpha,beta-unsaturated amides derived from morpholine, or esters. A mechanism has been proposed to explain the sequential process and the stereoselecti… Show more

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Cited by 11 publications
(2 citation statements)
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“…In the literature various entries to Z-a-haloacrylates 2 are reported, but only few are stereoselective and none are catalytic processes. Among those, one can mention dehydrohalogenation of a,b-halogenated esters, 20 and transition-metal promoted reactions using dissuasive stoichiometric amounts of Mn, 21 Cr, 22 Fe, 23 or Sm. 24 The Wittig 25 and Horner-Wadsworth-Emmons 26 reactions have been extensively used to access both E-and Z-a-bromoacrylates with acceptable E/Z selectivity, but the HWE pathway to a-chloroacrylates 2 is poorly documented 27 and has been reported to occur with medium or even no E/Z selectivity at all.…”
mentioning
confidence: 99%
“…In the literature various entries to Z-a-haloacrylates 2 are reported, but only few are stereoselective and none are catalytic processes. Among those, one can mention dehydrohalogenation of a,b-halogenated esters, 20 and transition-metal promoted reactions using dissuasive stoichiometric amounts of Mn, 21 Cr, 22 Fe, 23 or Sm. 24 The Wittig 25 and Horner-Wadsworth-Emmons 26 reactions have been extensively used to access both E-and Z-a-bromoacrylates with acceptable E/Z selectivity, but the HWE pathway to a-chloroacrylates 2 is poorly documented 27 and has been reported to occur with medium or even no E/Z selectivity at all.…”
mentioning
confidence: 99%
“…113,114 Com alguns desses produtos obtidos, foram realizadas reações de substituição e redução na carbonila, verificando-se que tanto o cloro quanto a dupla ligação permaneceram intactas. 113,114 Nesses trabalhos [109][110][111][112][113][114] foram utilizados aldeídos e cetonas funcionalizadas, contendo grupos olefínicos, anilínicos, anisólicos, nitro, heterociclos, dentre outros, e, mesmo assim, as reações ocorreram exclusivamente na carbonila, o que torna o método excelente alternativa à obtenção de blocos de construção polifuncionalizados.…”
Section: Sínteses Estereosseletivas De Compostos Carbonilados α-Halogunclassified