Cu(II)-Catalyzed Construction of Heterobiaryls using 1-Diazonaphthoquinones: A General Strategy for the Synthesis of QUINOX and Related P,N Ligands
作者:Aniruddha Biswas、Subarna Pan、Rajarshi Samanta
DOI:10.1021/acs.orglett.2c00127
日期:2022.3.4
was developed for the synthesis of heterobiaryls using easily available N-oxides and diazonaphthoquinones under cheap Cu(II) catalysis. The developed method offered QUINOX and related congeners in a simple manner. A wide scope of important heterobiaryls was achieved with high site selectivity. The synthesized naphthols were transformed into the privileged related P,N ligands. Suitable resolution methods
Synthesis of Axially Chiral QUINAP Derivatives by Ketone‐Catalyzed Enantioselective Oxidation
作者:Peng‐Ying Jiang、San Wu、Guan‐Jun Wang、Shao‐Hua Xiang、Bin Tan
DOI:10.1002/anie.202309272
日期:2023.10.2
reaction for the enantioselectiveoxidation of N atoms was developed and effectively applied to the atroposelective kinetic resolution of QUINAPOs and related compounds. Both highly enantioenriched QUINAPO N-oxide products could be readily converted into QUINAPs without loss of chiral integrity. QUINAPO N-oxide was also shown to act as a chiral Lewis base catalyst in a series of enantioselective transformations
开发了一种用于 N 原子对映选择性氧化的酮催化反应,并有效地应用于 QUINAPO 和相关化合物的对映选择性动力学拆分。两种高度对映体富集的 QUINAPO N-氧化物产物可以很容易地转化为 QUINAP,而不损失手性完整性。QUINAPO N-氧化物还被证明在一系列对映选择性转化中充当手性路易斯碱催化剂。
Synthesis and resolution of 1-(2-diphenylphosphino-1-naphthyl)isoquinoline; a PN chelating ligand for asymmetric catalysis.
作者:Nathaniel W. Alcock、John M. Brown、David I. Hulmes
DOI:10.1016/s0957-4166(00)80183-4
日期:1993.4
A multistep synthesis resulting in a good yield of the title compound has been developed based on the Pd-catalysed coupling of 1-chloroisoquinoline and 2-methoxy-1-naphthylboronic acid (5). The product is converted into the corresponding tfifluoromethanesulphonate (10) by successive demethylation and treatment with (CF3CO)2O, followed by a further Pd-catalysed coupling with Ph2P(O)H. The resulting phosphine oxide (11) was cleanly reduced with HSiCl3. Resolution of the phosphinamine (4) was carried out with the Pd complex derived from (R)-(+)-dimethyl(1-(1-naphthyl)ethyl)amine and PdCl2; the diastereomers were of different stabilities and solubilities and were therefore readily separated. The resolved phosphinamine, [alpha]D22 +/- 153 (c = 1, CHCl3), was enantiomerically stable on heating to 65-degrees-C for 24h. X-ray crystal structures of the adduct (16) and the Pd dimer (7) isolated during the initial coupling reaction are presented.