Rhodium(II) acetate catalyzed reactions of various substituted 3-diazopiperidin-2-ones with a range of aromatic amines, indoles, and benzotriazole yield exclusively the corresponding N–H insertion products despite competing C-H or O-H insertions. This strategy provides an example of a facile chemoselective N–H insertion reaction delivering a library of 3-arylamino and 3-heteroarylpiperidin-2-one derivatives
Photochemical Rearrangement of <i>N</i>-Chlorolactams: A Route to <i>N</i>-Heterocycles through Concerted Ring Contraction
作者:Dana K. Winter、Alexandre Drouin、Jean Lessard、Claude Spino
DOI:10.1021/jo100181h
日期:2010.4.16
We report a novel ringcontraction allowing the direct conversion of N-chlorolactams to their corresponding ring-contraction N-heterocycles upon photolysis. Results show that the rearrangement occurs with a variety of N-chlorolactams and that the greater the substitution at the migrating carbon, the greater the yield of product. Importantly, stereochemistry at the migrating carbon is conserved in the
Rhodium(II) catalyzed carbenoid reactions of 3-diazopiperidin-2-ones were carried out with indoles and pyrroles to afford the respective (3-indol-3-yl)- and (3-pyrrol-2-yl)piperidones with regioselectivity. Interestingly, the reaction of bis-diazoimide in the presence of Rh2(OAc)4 catalyst furnished diazacyclopenta[a]phenalenone in a tandem manner.
用吲哚和吡咯进行3-重氮哌啶-2-酮的铑(II)催化的类胡萝卜素反应,得到具有区域选择性的相应的(3-吲哚-3-基)-和(3-吡咯-2-基)哌啶酮。有趣的是,双重氮酰亚胺在Rh 2(OAc)4催化剂存在下的反应以串联方式提供了二氮杂环戊达[ a ]苯丙烯酮。
Polycyclic Ring Formation Using Bis-diazolactams for Cascade Stitching
作者:Sara A. Bonderoff、Albert Padwa
DOI:10.1021/acs.joc.6b02663
日期:2017.1.6
3-sigmatropic rearrangement, as well as nitrogen ylide formation followed by azetidine ring expansion. The initial reaction can be paired with a subsequent tandem cascade sequence involving dipole formation/cycloaddition in either an intra- or intermolecular sense to generate polycyclic N-heterocycles in one pot, with the formation up to three new rings in a single operation. Excellent diastereoselectivity
The synthesis and chemistry of 3-diazo-piperidin-2-one
作者:Ian S Hutchinson、Stephen A Matlin、Antonio Mete
DOI:10.1016/s0040-4020(02)00278-8
日期:2002.4
The efficient synthesis of 3-diazo-piperidin-2-one, from l-ornithine, in two steps is reported. The chemistry of this new cyclic α-diazoamide was explored and allows the rapid access to a wide range of 3-substituted piperidin-2-one derivatives.