通过在温和的反应条件下使用手性N,N'-二氧化物/ Ni II络合物作为催化剂,可以实现羟吲哚衍生物的高对映选择性[2,3] Wittig重排。观察到很强的手性扩增效果,并且通过使用仅含15%ee的配体,可以高收率和对映选择性(高达92%ee)接近带有烯丙基的手性3-羟基3-取代的羟吲哚。根据实验研究和对映体纯和外消旋催化剂的X射线晶体结构,给出了合理的解释。此外,通过[2,3] Wittig重排实现了外消旋羟吲哚衍生物的第一催化动力学拆分,具有很高的效率和立体选择性。
Enantioselective trapping of oxonium ylide intermediates by N -benzhydryl- α -imino ester: Synthesis of β -tetrasubstituted α -amino acids
作者:Shi-Kun Jia、Yu-Bing Lei、Long-Long Song、Shun-Ying Liu、Wen-Hao Hu
DOI:10.1016/j.cclet.2016.06.053
日期:2017.2
Abstract A synergistic rhodium(II)/phosphoric acid catalyzed three component reaction of 3-diazooxindoles, alcohols and N-benzhydryl-α-imino ester is developed for the efficient construction of chiral β-alkoxy Cβ-tetrasubstituted α-aminoacid derivatives in good yields and with excellent diastereoselectivities and high enantioselectivities. The synthetic application of the resulting products was illustrated
A Rh(<scp>ii</scp>)-catalyzed three-component reaction of 3-diazooxindoles with N,N-disubstituted anilines and glyoxylates for the synthesis of 3-aryl-3-substituted oxindoles
作者:Shi-Kun Jia、Long-Long Song、Yu-Bing Lei、A. Gopi Krishna Reddy、Dong Xing、Wen-Hao Hu
DOI:10.1039/c6ob01907b
日期:——
A simple and effective method for the synthesis of 3-aryl-3-substituted oxindole derivatives via a [Rh]-catalyzed three-componentreaction of 3-diazooxindoles with N,N-disubstituted anilines and glyoxylates is developed. This transformation is proposed to proceed through an intermolecular aldol-type trapping of zwitterionic intermediates.
‘On-water’ generation of carbonyl ylides from diazoamides: rhodium(II) catalyzed synthesis of spiroindolo-oxiranes and -dioxolanes with an interesting diastereoselectivity
作者:Sengodagounder Muthusamy、Rajagopal Ramkumar
DOI:10.1016/j.tet.2015.06.076
日期:2015.9
The ‘on-water’ generation of carbonylylide dipoles from diazoamides in the presence of rhodium(II) acetate dimer as the catalyst was demonstrated for the first time to synthesize spiroindolo-oxiranes and -dioxolanes. Unusual generation of carbonylylides with aromatic aldehydes having electron-withdrawing substituents and 1,3-dipolar cycloaddition reactions with aromatic aldehydes having electron-donating
C(sp2)–H Bond Multiple Functionalization in Air for Construction of Tetrahydrocarbazoles with Continuous Quaternary Carbons and Polycyclic Diversification
作者:Longlong Song、Dan Ni、Shikun Jia、Rou Pi、Suzhen Dong、Fan Yang、Jie Tang、Shunying Liu
DOI:10.1021/acs.orglett.0c00145
日期:2020.3.6
The C(sp2)-H function of indole ketone with diazo compound via a rhodium(II)-catalyzed intramolecular electrophilic trapping reaction under mild conditions in air was demonstrated. The established methodology provided a highly efficient approach for direct synthesis of mutisubstituted tetrahydrocarbazoles with continuous quaternary carbons. The resulting products facilitate further modification to