CuI-Catalyzed Synthesis of Functionalized Terminal Allenes from 1-Alkynes
作者:Hongwen Luo、Shengming Ma
DOI:10.1002/ejoc.201201696
日期:2013.5
equiv.), a facile and efficient protocol for the gram-scale synthesis of functionalizedterminalallenes by using CuI (7.5–10 mol-%), paraformaldehyde (1.6 equiv.), and diisopropylamine (1.4 equiv.) has been developed. This method accommodates different functional groups such as hydroxy or carbonyl, and it also performed well in the synthesis of allenylamides and 2,3-butadien-1-ol.
作者:Ursula Streit、Frédéric Birbaum、Anna Quattropani、Christian G. Bochet
DOI:10.1021/jo4002307
日期:2013.7.19
report on a new intramolecular para cycloaddition of arenes with allenes, yielding attractive rigid scaffolds bearing several reactive functionalities to build in further diversity. Bicyclo[2.2.2]octadiene-type products and benzoxepine acetals are formed in this reaction, in ratios and yields depending on the substitution pattern on the aromatic ring, the nature of the chromophore, and the tether. This unprecedented
Reactivity of sarcosine and 1,3-thiazolidine-4-carboxylic acid towards salicylaldehyde-derived alkynes and allenes
作者:Fernanda M. Ribeiro Laia、Clara S.B. Gomes、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.tet.2013.09.052
日期:2013.11
The reaction of sarcosine and 1,3-thiazolidine-4-carboxylic acid with salicylaldehyde-derived alkynes and allenes opened the way to new chromeno[4,3-b]pyrrole and chromeno[2,3-b]pyrrole derivatives. Tetrahydro-chromeno[4,3-b]pyrroles were obtained from the reaction of these secondary aminoacids with O-propargylsalicylaldehyde. Interestingly, sarcosine reacted with ethyl 4-(2-formylphenoxy)but-2-ynoate
肌氨酸和1,3-噻唑烷-4-羧酸与水杨醛衍生的炔烃和丙二烯反应打开了通向新色烯并[4,3- b ]吡咯并色烯并[2,3- b ]吡咯衍生物。四氢色烯并[4,3- b从这些仲氨基酸与反应获得]吡咯ö -propargylsalicylaldehyde。有趣的是,肌氨酸用乙酸乙酯反应4-(2-甲酰基苯氧基)丁-2-炔酸甲酯,得到单环吡咯从初始形成的1,3-偶极环加成的重排得到。4-(2-甲酰基苯氧基)丁-2-炔酸甲酯与1,3-噻唑烷-4-羧酸在立体选择性方式得到预期色烯并吡咯并脱羧缩合[1,2 Ç]噻唑,其结构是由明确的X射线晶体学确定。然而,1 ħ,3 ħ吡咯并[1,2- c ^ ]距离吡喃环的开口得到的噻唑也被分离。与反应ö -丁-2,3-二烯基水杨醛,得到3-亚甲基hexahydrochromeno [4,3- b ]吡咯。ø -Allenyl水杨醛与肌氨酸和1,3-噻唑烷-4-羧酸反应
Photochemistry of Allenyl Salicylaldehydes
作者:Frédéric Birbaum、Antonia Neels、Christian G. Bochet
DOI:10.1021/ol800806a
日期:2008.8.7
aldehydes containing allene side chains is a versatile reaction as it provides a rapid and efficient access to original complex structures such as 1,3,4-tetrahydro-1,4-epoxy-5-alkylidene-2-benzoxepines 2 and substituted 2-oxa-tricyclo[5.2.2.0] (1,5)undeca-4,8,10-triene-9-carbaldehydes 3. Novel polycyclic structures are characterized, and optimized strategies for the synthesis of the substrates 1 are
The synthesis of regio- and stereoselective arylsubstitutedα,β-unsaturated aldehydes and ketones from activated allenes was achieved. This mild and non-metallic oxidation is exclusively driven by benign ambient air and triggered by visible light. The same starting materials under ideal anaerobic conditions led to the 2,3-diphenylselenation adduct with no trace of oxygenated products, demonstrating