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Preparation of 3-alkyl .beta.-lactams via the ketene imine cycloaddition reaction using .alpha.-(phenylthio)alkanoyl halides as starting materials: application to the synthesis of (.+-.)-carbapenem building blocks and related compounds
作者:Claudio Palomo、Fernando P. Cossio、Jose M. Odiozola、Mikel Oiarbide、Jesus M. Ontoria
DOI:10.1021/jo00014a017
日期:1991.7
Preparation of appropriately substituted 3-alkyl beta-lactams via the ketene (or equivalent)-imine cycloaddition reaction is described. The dehydrochlorination reaction of alpha-(phenylthio)alkanoyl chlorides with triethylamine in the presence of imines derived from cinnamaldehydes and p-anisidine produced a high-yield formation of alpha-phenylthio beta-lactams, which upon desulfuration furnished a variety of 3-alkyl beta-lactams in a highly stereoselective fashion. In contrast, reaction between alpha-haloalkanoyl chlorides and cinnamylideneamines in the presence of triethylamine furnished the corresponding [4 + 2] cycloadducts as main products. Preparation of highly functionalized alpha-alkylidene beta-lactams through thermal decomposition of the corresponding beta-lactam sulfoxides or by cycloaddition of alpha,beta-unsaturated acid chlorides to imino esters in the presence of triethylamine is also described. Addition of Flemming's silylcuprate reagent to alpha-alkylidene beta-lactams furnished the corresponding 3-(1'-(dimethylphenylsilyl(ethyl) beta-lactams as (+/-)-thienamycin intermediates.
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Alkyl(phenylthio)ketenes as synthetic equivalents of monoalkylketenes: A concise general route to 3-alkyl β-lactams as carbapenem building-blocks
作者:Claudio Palomo、Fernando P. Cossío、José M. Odriozola、Mikel Oiarbide、Jesús M. Ontoria
DOI:10.1016/s0040-4039(01)80749-8
日期:1989.1
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PALOMO, CLAUDIO;COSSIO, FERNANDO P.;ODRIOZOLA, JOSE M.;OIARBIDE, MIKEL;ON+, TETRAHEDRON LETT., 30,(1989) N4, C. 4577-4580
作者:PALOMO, CLAUDIO、COSSIO, FERNANDO P.、ODRIOZOLA, JOSE M.、OIARBIDE, MIKEL、ON+
DOI:——
日期:——
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PALOMO, CLAUDIO;COSSIO, FERNANDO P.;ODIZOLA, JOSE M.;OIARBIDE, MIKEL;ONTO+, J. ORG. CHEM., 56,(1991) N4, C. 4418-4428
作者:PALOMO, CLAUDIO、COSSIO, FERNANDO P.、ODIZOLA, JOSE M.、OIARBIDE, MIKEL、ONTO+
DOI:——
日期:——
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Pusino,A. et al., Gazzetta Chimica Italiana, 1978, vol. 108, p. 557 - 565
作者:Pusino,A. et al.
DOI:——
日期:——