Efficient and Direct Nucleophilic Difluoromethylation of Carbonyl Compounds and Imines with Me<sub>3</sub>SiCF<sub>2</sub>H at Ambient or Low Temperature
作者:Yanchuan Zhao、Weizhou Huang、Ji Zheng、Jinbo Hu
DOI:10.1021/ol202208b
日期:2011.10.7
by using a proper Lewis base activator, Me3SiCF2H can efficiently difluoromethylate various aldehydes, ketones, and imines to give the corresponding products in good to excellent yields at room temperature or even at −78 °C.
α,α-Difluoro-α-(trimethylsilyl)acetamides as Versatile Reagents for the Preparation of Difluorinated Aldol and Mannich Adducts
作者:Aurélien Honraedt、Arie Van Der Lee、Jean-Marc Campagne、Eric Leclerc
DOI:10.1002/adsc.201700371
日期:2017.8.17
The very efficient addition of α,α‐difluoro‐α‐(trimethylsilyl)acetamides to aldehydes, ketones and N‐(tert‐butanesulfinyl)imines is described. The reaction is promoted by a catalytic amount of tetra‐n‐butylammonium diphenyltrifluorosilicate (TBAT) and high yields, as well as very high stereoselectivities in the case of N‐(tert‐butanesulfinyl)imines, are achieved. The synthetic potential of this method
highly enantioselectivefluoroarylation of gem‐difluoroalkenes with aryl halides is presented by using a new chiral sulfinamide phosphine (Sadphos) type ligand TY‐Phos. N‐Me‐TY‐Phos can be easily synthesized on a gram scale from readily available starting materials in three steps. Salient features of this work including readily available starting materials, good yields, high enantioselectivities as well
Asymmetric synthesis of chiral amines by highly diastereoselective 1,2-additions of organometallic reagents to N-tert-butanesulfinyl imines
作者:Derek A. Cogan、Guangcheng Liu、Jonathan Ellman
DOI:10.1016/s0040-4020(99)00451-2
日期:1999.7
High yielding and highly diastereoselective methods for 1,2-additions of organometallic reagents to N-tert-butanesulfinyl aldimines (2) and N-tert-butanesulfinyl ketimines (3) are described. The additions of alkyl, aryl, alkenyl, and allyl carbanions to a diverse set of imines with different steric and electronic properties are demonstrated. Acidic methanolysis of the sulfinamide products (4 and 6)
Sulfinamide Phosphinates as Chiral Catalysts for the Enantioselective Organocatalytic Reduction of Imines
作者:Ahmed Chelouan、Rocío Recio、Lorenzo G. Borrego、Eleuterio Álvarez、Noureddine Khiar、Inmaculada Fernández
DOI:10.1021/acs.orglett.6b01509
日期:2016.7.1
A new type of chiral sulfinamide phosphinate catalysts with up to three stereogenic centers, readily accessible from commercially available starting materials, is reported. The naphthyl derivative SulPhos proved to be highly efficient in the organocatalytic asymmetric iminereduction, leading to a wide range of arylmethylamines in high yields with up to 99% ee under 10% catalyst loading. The synthetic