XY–ZH systems as potential 1,3-dipoles. Part 1. Background and scope
作者:Ronald Grigg、H. Q. Nimal Gunaratne、James Kemp
DOI:10.1039/p19840000041
日期:——
XY–ZH Systems are considered in general terms and divided into four classes according to the number of constituent atoms that possess lone-pair electrons. Those systems in which the central Y atom possesses a lone pair are shown to be capable of participating in formal 1,2-H shifts generating 1,3-dipolar species. The scope of the reaction, including its possible relevance to the biochemistry of pyridoxal
X Y–ZH系统被视为通用术语,根据拥有孤对电子的组成原子的数量分为四类。中心Y原子具有孤对的那些系统显示出能够参与形成1,2-H移位的正式1,2-H移位,从而产生1,3-偶极物种。讨论了反应的范围,包括其可能与吡ido醛酶生物化学的相关性,并通过速率数据证明了一系列苯基甘氨酸和丙氨酸甲酯的芳基亚胺环加成N-苯基马来酰亚胺的速率对结构的影响。
Catalytic chemoselective [3+3] cycloadditions of azomethine ylides with quinone monoimides leading to the construction of a dihydrobenzoxazine scaffold
作者:Cong-Shuai Wang、Ren-Yi Zhu、Yu-Chen Zhang、Feng Shi
DOI:10.1039/c5cc03341a
日期:——
A chemoselective [3+3] cycloaddition of in situ generated azomethine ylides with quinone monoimides has been established, which efficiently led to the construction of dihydrobenzoxazine frameworks with biological relevance.
Cu(OAc)<sub>2</sub>/FOXAP complex catalyzed construction of 2,5-dihydropyrrole derivatives via asymmetric 1,3-dipolar cycloaddition of azomethine ylides to ethynyl ketones
作者:Fei-Fei Tang、Wu-Lin Yang、Xingxin Yu、Wei-Ping Deng
DOI:10.1039/c5cy00422e
日期:——
Catalytic asymmetric1,3-dipolarcycloaddition of azomethineylides to ethynyl ketones catalyzed by the Cu(OAc)2/FOXAP (ferrocenyl oxazolinylphosphine) complex was developed, affording 2,5-dihydropyrrole derivatives in good to excellent yields (up to 99%) and excellent levels of enantioselectivities (up to 98% ee). This highly efficient chiral N,P-ligand/Cu(OAc)2 catalytic system was also applicable
Ortho-palladated imines as precursors of metallo-1,3-dipoles
作者:Ronald Grigg、John Devlin
DOI:10.1039/c39860000631
日期:——
Ortho-palladatedimines of α-amino acid esters are deprotonated by triethylamine at ambient temperature and the resulting metallo-1,3-dipoles can be trapped by cycloaddition to N-phenylmaleimide in good yield.