Syntheses of heterocyclic compounds. Part XXIV. Cyclisation studies with ortho-substituted arylcarbene and arylnitrene precursors
作者:G. V. Garner、D. B. Mobbs、H. Suschitzky、J. S. Millership
DOI:10.1039/j39710003693
日期:——
indolines. The scope and mechanism of this cyclisation have been explored. Moreover, benzaldehyde tosylhydrazones with o-alkoxy-, o-thioalkyl-, and o-phosphonate substituents as well as the corresponding diazoalkanes were pyrolysed and photolysed. The products from these carbene precursors were compared with those obtained from the analogous nitrene precursors [i.e. ArN3 or ArNO2+(RO)3P].
Spirocyclic Tetramates by Sequential Knoevenagel and [1,5]-Prototropic Shift
作者:Laia Josa-Culleré、Michael G. Hirst、Jonathan P. Lockett、Amber L. Thompson、Mark G. Moloney
DOI:10.1021/acs.joc.9b01345
日期:2019.8.2
Highly functionalized spirocyclic tetramates were prepared via a sequential Knoevenagel reaction and [1,5]-prototropic shift (T-reaction) of bicyclic tetramates. While these compounds isomerize in solution, stable analogues can be prepared via an appropriate choice of substituents. Further modification of these compounds allows for the introduction of aromatic groups, making them suitable as skeletons
Reported herein is the hydride transfer initiated redox-neutral cascadecyclizations of aurones, providing a variety of [6,5] spiro-heterocycles in satisfactory yields and good diastereoselectivities.
作者:Ivanov, Dmitrii S.、Smirnov, Alexander Yu.、Baranov, Mikhail S.
DOI:10.1007/s10593-024-03332-0
日期:——
A method for the synthesis of 1,4-dihydroquinoline-3-carbonyl compounds from 2-benzoyl-3-[2-(dialkylamino)aryl]acrylates via the sequence of 1,5-hydride shift, dealkylation, and cyclization processes was proposed. The reaction products contained a push-pull enamine fragment.
Interaction of barbituric acids with o-dialkylaminobenzaldehydes
作者:Konstantin A. Krasnov、Viktor G. Kartsev、Victor N. Khrustalev
DOI:10.1070/mc2006v016n01abeh002216
日期:2006.1
Barbituric or 2-thiobarbituric acids interact with o-dialkylaminobenzaldehydes to give 5-o-dialkylaminobenzylidene derivatives, which cyclise into 2,4,6-trioxoperhydropyrimidine-5-spiro-3′-(1′,2′,3′,4′-tetrahydroquinolines) under mild conditions; the mechanism of the key stage of a tert-amino effect reaction is disclosed on the basis of the XRD analysis of 1,3-dimethyl-5-(2-dimethylamino-4-nitrobe