Thermolysis of Imidates: A New Method for the Generation of Carbonyl Ylides
作者:Vsevolod V. Nikolaev、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200790239
日期:2007.12
Thermolysis of dimethyl 2-[(3-oxo-3H-isoindol-1-yl)oxy]malonate (8) promotes a [1,4]-H shift in the imidic NCOCH fragment of the starting molecule, which leads to a reactive carbonylylide. This carbonylylide can be trapped by the CN bond of imidates and imines, as well as the CO bond of benzaldehyde. The corresponding cycloadducts 11, 14, and 16 are formed regioselectively in good yields (60–95%)
2-[((3-oxo-3 H -isoindol-1-yl)oxy]丙二酸二甲酯(8)的热解促进起始分子的亚胺基NCOCH片段中的[1,4] -H移位,从而导致反应性羰基内酯。该羰基内酯可被酰亚胺和亚胺的CN键以及苯甲醛的CO键捕获。相应cycloadducts 11,14,和16中形成区域选择性地以良好的收率(60-95%)中,用高立体选择性。在11的情况下,溶液中的次要环加合物进行异构化以得到更稳定的立体异构体。两个cycloadducts,该结构即,11A和14A,已经通过X射线晶体学确定。
RhII-Catalyzed Reactions of Diazocarbonyl Compounds with Dicarboximides
作者:Vsevolod V. Nikolaev、Heinz Heimgartner、Anthony Linden、Ivan S. Krylov、Valerij A. Nikolaev
DOI:10.1002/ejoc.200600396
日期:2006.10
phthalimide and succinimide proceeds chemoselectively at the oxygen atom of the imidic carbonyl group, giving rise to the intermediate formation of carbonylylides. Intramolecular stabilization of these highly reactive species occurs in three different ways, and is controlled by the structure of the 2-oxocarbenoids. Carbonylylides from diazo esters mainly experience a [1,4]-hydrogen shift, and in this case