Herein, we wish to report a new and convenient method for the synthesi of 2-unsubstituted1,3-selenazoles which relies on the fragmentation of novel 2-benzoyl-l,3-selenazoles.6 In addition, a second ap- proach to 2-unsubstituted1,3-selenazoles by cyclization of selenoformamide with u-bromoketones is reported. The cyclization of a-bromoacetophenone (la) with sele- nophenylacetic amide (2a), prepared
Aliphatic and aromaticprimaryselenoamides 2 were isolated by the reaction of the corresponding aliphatic and aromatic nitriles with potassium 4-methylselenobenzoate in the presence of BF3·Et2O in moderate from high yields.
Tandem Michael–Nucleouphilic Addition of 2‐Cyclopropylidene Propionaldehyde—A Novel Method for the Synthesis of Spirocyclopropane‐Annulated Heterocycles
作者:Xian Huang、Lei Yu、Zhen‐Hua Chen
DOI:10.1081/scc-200054852
日期:2005.5
Abstract 8‐Methyl‐4‐thia‐6‐aza‐spiro[2.5]oct‐5‐en‐7‐ols and 8‐methyl‐4‐selena‐6‐aza‐spiro[2.5]oct‐5‐en‐7‐ols were synthesized in moderate to good yields via tandem Michael–nucleophilic addition of 2‐cyclopropylidenepropionaldehyde under mild conditions.
selenoamides (2) from nitriles, metallic selenium, carbonmonoxide, water, and amines have been developed on the basis of an amino-group-exchange reaction of in situ formed N-unsubstituted selenoamides (1) with primary or secondary amines. The reactions consist of two processes, i.e., the formation of selenoamides 1 by the reaction of nitriles and H2Se formed from selenium, carbonmonoxide and water, and the subsequent
A Convenient Synthesis of Selenocarboxamides from Nitriles
作者:Rafal Kamiñski、Richard S. Glass、Aleksandra Skowroñska
DOI:10.1055/s-2001-15232
日期:——
Aromatic and aliphatic nitriles can be conveniently converted into the corresponding selenocarboxamides with monoselenophosphate in aqueous alcohol in 50-94 % yield.