Synthesis and Structure of Protic Amine Tethered Rhodium(III) Peralkylcyclopentadienyl Complexes
摘要:
A series of mononuclear tethered complexes, Rh(III)-(eta(5):eta(1)-Cp'-NHR), in which the eta(5)-peralkylcyclopentadienyl group and the ligated protic amine group are connected by suitable carbon chains, were newly prepared and structurally characterized. Their catalytic performance in the reductive amination of carbonyl compounds was significantly influenced by the chain length of the tether, which possibly plays a key role in determining the reaction course.
A Versatile Synthesis of Vinyl-Substituted Heterocycles via Regio- and Enantioselective Pd-Catalyzed Tandem Allylic Substitution
作者:Chao Qian、Wenjun Tang
DOI:10.1021/acs.orglett.0c01490
日期:2020.6.5
We herein report a versatile, regio- and enantioselective palladium-catalyzed tandem allylicsubstitution powered by a chiral bisphosphorus ligand WingPhos with the palladium loading as low as 0.1 mol %, forming a series of chiral vinyl-substituted heterocycles, including tetrahydroquinoxalines, piperazines, dihydro-2H-benzo[b][1,4]-oxazines, and morpholines, in exellent ee’s and yields. The protocol
我们在本文中报道了一种手性双磷配体WingPhos驱动的多功能,区域和对映体选择性的钯催化串联烯丙基取代,钯载量低至0.1 mol%,形成了一系列手性乙烯基取代的杂环,包括四氢喹喔啉,哌嗪,二氢-2 H-苯并[ b ] [1,4]-恶嗪和吗啉的优异ee和收率。该方案具有易于获得的起始原料,温和的反应条件和广泛的底物范围。机制研究支持串联烯丙基取代过程。
Synthesis and Structure of Protic Amine Tethered Rhodium(III) Peralkylcyclopentadienyl Complexes
A series of mononuclear tethered complexes, Rh(III)-(eta(5):eta(1)-Cp'-NHR), in which the eta(5)-peralkylcyclopentadienyl group and the ligated protic amine group are connected by suitable carbon chains, were newly prepared and structurally characterized. Their catalytic performance in the reductive amination of carbonyl compounds was significantly influenced by the chain length of the tether, which possibly plays a key role in determining the reaction course.