A cyanoborohydride‐promoted radicalcyclization methodology has been developed to access α‐chlorolactams in a simple and efficient way using NaBH3CN and trichloroacetamides easily available from allylic and homoallylic secondary amines. This methodology allowed the synthesis of a library of α‐chlorolactams (mono‐ and bicyclic), which were tested for herbicidal activity, trans‐3‐chloro‐4‐methyl‐1‐(
Metal-Free Formal Oxidative C−C Coupling by In Situ Generation of an Enolonium Species
作者:Daniel Kaiser、Aurélien de la Torre、Saad Shaaban、Nuno Maulide
DOI:10.1002/anie.201701538
日期:2017.5.15
contemporary organic synthesis relies on transformations that are driven by the intrinsic, so‐called “natural”, polarity of chemical bonds and reactive centers. The design of unconventionally polarized synthons is a highly desirable strategy, as it generally enables unprecedented retrosynthetic disconnections for the synthesis of complex substances. Whereas the umpolung of carbonyl centers is a well‐known
The Lewis acid promoted reactions of 2-substituted 2-propenyl amides and the 2-methylbuta-2,3-dienyl ester of ethenetricarboxylate have been examined. The reactions of 2-substituted 2-propenyl amides with AlCl3 gave 2-oxo-5,6-dehydropiperidines as the major products. The reaction of 2-methylbuta-2,3-dienyl ester with Lewis acids such as AlCl3 and SnCl4 gave 2-oxo-3,6-dihydropyran as the major product
Regio- and stereo-selective vinylic and allylic lithiation of methylallyl amines
作者:José Baluenga、Rosario Gonzáles、Francisco J. Fañanás
DOI:10.1016/s0040-4039(00)60827-4
日期:——
Methylallylamines 1 have been regio- and stereo-selective lithiated with tert-butyllithium either at the vinylic or at the allylic position by only changing the reaction conditions, giving the corresponding dianions 2 and 3, which by reaction with electrophiles (deuterium oxide, tributylin chloride, benzaldehyde, acetone, or benzylidenaniline) give the products 4 and 5.
One-pot synthesis of α,β-unsaturated butyralactams from allyl amines
作者:José Barluenga、Francisco J. Fañanás、Francisco Foubelo、Miguel Yus
DOI:10.1016/s0040-4039(00)80627-9
日期:1988.1
The successive reaction of different allylamines with -butyl -lithium, -butyl-lithium, and diethylcarbonate at temperatures ranging between -50 and 20°C leads after hydrolysis to the corresponding α,β-unsaturated butyrolactams in an one-pot process.