已经开发了带有L-脯氨酸衍生的N 4配体的新型锰催化剂,其能够使用叔丁基氢过氧化物作为氧化剂实现烯烃的无酸不对称环氧化。大小与配位体袋完全匹配的各种烯烃可以转化为具有出色对映选择性的环氧化物。较小的配体口袋也有利于简单烯烃的对映选择性环氧化。低温喷雾电离质谱实验表明,Mn IV O物种可作为活性环氧化物种。
Dioxygen-Promoted Pd-Catalyzed Aminocarbonylation of Organoboronic Acids with Amines and CO: A Direct Approach to Tertiary Amides
作者:Long Ren、Xinwei Li、Ning Jiao
DOI:10.1021/acs.orglett.6b02913
日期:2016.11.18
A direct approach from organoboronic acids and amines to tertiary amides via Pd-catalyzed aerobic aminocarbonylation has been developed. The presence of O2 significantly promotes the efficiency of this transformation. This method uses commercially available organoboronic acids and cheap CO and O2 (1 atm), which renders amides an easy synthesis with broad substrate scope and high functional group tolerance
An efficient asymmetric hydrophosphonylation of unsaturated amides catalyzed by rare-earth metal amides [(Me<sub>3</sub>Si)<sub>2</sub>N]<sub>3</sub>RE(μ-Cl)Li(THF)<sub>3</sub> with phenoxy-functionalized chiral prolinols
作者:Zenghui Fei、Chao Zeng、Chengrong Lu、Bei Zhao、Yingming Yao
DOI:10.1039/c7ra00468k
日期:——
An asymmetric hydrophosphonylation reaction of diethyl phosphite with α,β-unsaturated amides catalyzed by [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 (RE = Sc (1), Y (2), La (3), Yb (4) and Lu (5)) with H2Ln ((S)-2,4-R2-6-[[2-(hydroxydiphenylmethyl)pyrrolidin-1-yl]methyl]phenol) (R = tBu (H2L1); R = 1-cumyl (H2L2) and R = 1-adm (H2L3)) was disclosed. The effects of different central metals and proligands on the addition
亚磷酸二乙酯与[(Me 3 Si)2 N] 3 RE(μ-Cl)Li(THF)3(RE = Sc(1),Y(2), La(3),Yb(4)和Lu(5))与H 2 L n((S)-2,4-R 2 -6-[[[((2-羟基二苯基甲基)吡咯烷-1-基]甲基]苯酚)(R = t Bu(H 2 L 1); R = 1-枯基(H 2 L 2)和R = 1-adm(H 2 L 3))被披露。测试了不同的中心金属和配体对加成反应的影响,发现Sc配合物1和配体H 2 L 2的结合效果最好。使用相对较宽的不饱和酰胺范围,可获得优异的化学收率(高达99%)和良好至高的对映选择性(从73%到89%不等)。还讨论了当前系统中的活跃物种。
Organic Syntheses via Transition Metal Complexes. 117.<sup>1</sup> 3-Aza-1-metalla-1,3,5-hexatrienes (M = Cr, W): Generation and π-Cyclization to Pyrroles
作者:Rudolf Aumann、Dominik Vogt、Roland Fröhlich
DOI:10.1021/om011032d
日期:2002.4.29
3-Aza-1-metallahexa-1,3,5-trienes 3a−f were obtained in good yields by condensation of the (NH2-amino)carbene complexes (CO)5MC(Ph)NH2 (1a,b; M = Cr, W) with α,β-unsaturated acid amides 2 in the presence of phosphoryl chloride and triethylamine. Compounds 3 undergo a thermally induced π-cyclization to pyrroles 4.
Ligand regulation for manganese-catalyzed enantioselective epoxidation of olefins without acid
作者:Daqian Xu、Qiangsheng Sun、Jin Lin、Wei Sun
DOI:10.1039/d0cc04440g
日期:——
been developed for enabling acid-free asymmetric epoxidation of olefins with tert-butyl hydroperoxide as the oxidant. A variety of olefins that are well-matched in size with the ligand pocket can be transformed to epoxides with excellent enantioselectivities. The smaller ligand pocket is also beneficial to the enantioselective epoxidation of simple olefins. Cryospray ionization mass spectrometry experiments
已经开发了带有L-脯氨酸衍生的N 4配体的新型锰催化剂,其能够使用叔丁基氢过氧化物作为氧化剂实现烯烃的无酸不对称环氧化。大小与配位体袋完全匹配的各种烯烃可以转化为具有出色对映选择性的环氧化物。较小的配体口袋也有利于简单烯烃的对映选择性环氧化。低温喷雾电离质谱实验表明,Mn IV O物种可作为活性环氧化物种。