A New General Method for the Preparation of <i>N</i>-Sulfonyloxaziridines
作者:José Luis García Ruano、José Alemán、Cristina Fajardo、Alejandro Parra
DOI:10.1021/ol052250w
日期:2005.11.1
N-alkylsulfonyl- and N-arylsulfonyloxaziridines from the corresponding N-sulfinylimines involving a one-pot, two-step oxidation process with m-CPBA (1 equiv) and m-CPBA/KOH (1.1 equiv) is reported. The method is applicable to N-sulfinylimines derived from aldehydes (aliphatic and aromatic) and ketones (dialkyl and aryl alkyl) and preserves C=C-conjugated double bonds. Almost quantitative yields, very mild
Highly enantioselective Rh-catalyzed transfer hydrogenation of N-sulfonyl ketimines
作者:Se Hun Kwak、Sun Ah Lee、Kee-In Lee
DOI:10.1016/j.tetasy.2010.04.047
日期:2010.4
species comprising N-sulfinyl and N-sulfonyl ketimine, oxime, and enamine derivatives were subjected to asymmetric transferhydrogenation in an azeotropic mixture of formic acid/triethylamine. Among them, the Rh-catalyzed transferhydrogenation of N-sulfonyl ketimine afforded the corresponding 1-arylalkylamines in excellent yield and with high enantioselectivity.
Highly Enantioselective Pd-Catalyzed Asymmetric Hydrogenation of Activated Imines
作者:You-Qing Wang、Sheng-Mei Lu、Yong-Gui Zhou
DOI:10.1021/jo0700878
日期:2007.5.1
complexes are highly effective catalysts for asymmetrichydrogenation of activated imines in trifluoroethanol. The asymmetrichydrogenation of N-diphenylphosphinyl ketimines 3 with Pd(CF3CO2)/(S)-SegPhos indicated 87−99% ee, and N-tosylimines 5 could gave 88−97% ee with Pd(CF3CO2)/(S)-SynPhos as a catalyst. CyclicN-sulfonylimines 7 and 11 were hydrogenated to afford the useful chiral sultam derivatives in
Pd /双膦配合物是用于活化的亚胺在三氟乙醇中不对称氢化的高效催化剂。Pd(CF 3 CO 2)/(S)-SegPhos对N-二苯基亚膦酰基酮亚胺3的不对称氢化表明ee为87-99%,N- tosylimines 5与Pd(CF 3 CO 2)可以得到88-97%ee /(S)-SynPhos作为催化剂。环状N-磺酰亚胺7和11 进行氢化,以79-93%ee的比重得到有用的手性舒马坦衍生物,这是重要的有机合成中间体和农业和医药制剂的结构单元。
Diastereoselective addition of diethyl difluoromethylphosphonate to enantiopure sulfinimines: synthesis of α,α-difluoro-β-aminophosphonates, phosphonic acids, and phosphonamidic acids
作者:Gerd-Volker Röschenthaler、Valery P. Kukhar、Michael Yu. Belik、Kateryna I. Mazurenko、Alexander E. Sorochinsky
DOI:10.1016/j.tet.2006.08.017
日期:2006.10
of diastereomerically pure N-sulfinyl α,α-difluoro-β-aminophosphonates with trifluoroacetic acid in EtOH followed by refluxing with 10 N HCl provided enantiopure α,α-difluoro-β-aminophosphonates and α,α-difluoro-β-aminophosphonic acids. The N-Cbz derivative of (R)-2-amino-1,1-difluoro-2-phenylethylphosphonate was a convenient starting point for the preparation of corresponding difluorophosphonate monoester
将二乙基硫代二氟甲基膦酸酯加到对映体纯的芳族,杂芳族和脂族醛衍生的亚磺酸亚胺中,得到的N-亚磺酰基α,α-二氟-β-氨基膦酸酯通常具有良好的对映选择性,并且产率很高。与苯乙酮衍生的亚磺胺的反应导致形成具有高非对映选择性且仅中等收率的加成产物。两步脱保护,包括在EtOH中用三氟乙酸处理非对映体纯的N-亚磺酰基α,α-二氟-β-氨基膦酸酯,然后与10 N HCl回流,得到对映体纯的α,α-二氟-β-氨基膦酸酯和α,α-二氟-β-氨基膦酸。(R的N -Cbz导数)-2-氨基-1,1-二氟-2-苯基乙基膦酸酯是制备相应的二氟膦酸酯单酯,二氟膦酸和二氟膦酰胺酸的方便起点。在21°C下,二氟膦酰胺酸在pH高于5的水溶液中稳定。
PREPARATION OF N-p-TOLYLSULFONYL-(E)-1-PHENYLETHYLIDENEIMINE
作者:Ruano, José Luis García、Alemán, José、Parra, Alejandro、Belén Cid、Oisaki, Kounosuke、Shibasaki, Masakatsu