Metallic samarium promoted reductive dimerization cyclization of gem-diactivated alkenes, reductive debromination of vic-dibromides, and reduction of sodium alkyl thiosulfates in aqueous media
作者:Lei Wang、Yongmin Zhang
DOI:10.1016/s0040-4020(99)00602-x
日期:1999.8
solution at room temperature, metallic samarium promoted reductive dimerization cyclization of gem-diactivated alkenes, reductive debromination of vic-dibromides, and reduction of sodium alkyl thiosulfates occur to afford corresponding functionalized cyclopentenes, (E)-alkenes, and disulfides, respectively in good yield. Only sub-stoichiometric quantities of samarium are employed in the former reactions
Solvent-Free Microwave Enhanced Knoevenagel Condensation of Ethyl Cyanoacetate with Aldehydes
作者:Alok Kumar Mitra、Aparna De、Nilay Karchaudhuri
DOI:10.1080/00397919908086438
日期:1999.8
Abstract A high yielding and fast method of Knoevenagel condensation of ethylcyanoacetate with various aldehydes under microwave irradiation using environment-friendly ammonium acetate in the absence of any solvent is described.
Zinc-mediated Reductive Dimerization Cyclization of Ethyl Arylmethylidene cyanoacetates in Aqueous Media
作者:Lei Wang、Yongmin Zhang
DOI:10.1039/a900711c
日期:——
Zinc-mediated reductive dimerization–cyclization of ethyl arylmethylidenecyanoacetates occurs to give diethyl 2-amino-3-cyano-4,5-diaryl-1,3-cyclopentenedicarboxylates in moderate to good yields the trans, trans-form isomer being the major product.