Tandem stereoselective synthesis of new trifluoromethylated pyranopyrazoles
作者:Jian Wang、Guan-Bo Huang、Li-Jun Yang、Feng Li、Jing Nie、Jun-An Ma
DOI:10.1016/j.jfluchem.2014.10.008
日期:2015.3
trifluoromethyl ketones is described. The notable features of this tandem process are its operational simplicity, easily accessible starting materials, and mild reaction conditions. The corresponding trifluoromethylated pyranopyrazoles were obtained in excellent yields (85–99%) with good to excellent diastereoselectivities (6:1–30:1). In addition, the stereochemical assignment of the major isomer by X-ray crystallographic
Enantioselective Alkynylation of Trifluoromethyl Ketones Catalyzed by Cation‐Binding Salen Nickel Complexes
作者:Dongseong Park、Carina I. Jette、Jiyun Kim、Woo‐Ok Jung、Yongmin Lee、Jongwoo Park、Seungyoon Kang、Min Su Han、Brian M. Stoltz、Sukwon Hong
DOI:10.1002/anie.201913057
日期:2020.1.7
Cation-binding salen nickel catalysts were developed for the enantioselective alkynylation of trifluoromethyl ketones in high yield (up to 99 %) and high enantioselectivity (up to 97 % ee). The reaction proceeds with substoichiometric quantities of base (10-20 mol % KOt-Bu) and open to air. In the case of trifluoromethyl vinyl ketones, excellent chemo-selectivity was observed, generating 1,2-addition
3-Carboxamide oxindoles as 1,3-C,N-bisnucleophiles for the highly diastereoselective synthesis of CF3-containing spiro-δ-lactam oxindoles featuring acyl at the ortho-position of spiro carbon atom
obtained in moderate to good yields with excellent diastereoselectivities under mild conditions. This work represents the first example of a systematic study of 3-carboxamide oxindoles as 1,3-C,N bisnucleophiles.
Catalytic Enantioselective Conjugate Alkynylation of α,β-Unsaturated 1,1,1-Trifluoromethyl Ketones with Terminal Alkynes
作者:Amparo Sanz-Marco、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro
DOI:10.1002/chem.201601303
日期:2016.7.11
trifluoromethyl ketones in the presence of a low catalytic load of a CuI‐MeOBIPHEP complex (2.5 mol %) and triethylamine (10 mol %) to give the corresponding trifluoromethyl ketones bearing a propargylic stereogenic center at the β position with good yields and excellent enantiomeric excesses in most of the cases. No 1,2‐addition products were formed under the reaction conditions. The procedure showed broad
Expansion of annulation of allenoates with trifluoroketones: Synthesis of trifluoromethylated dihydropyrans
作者:Tong Wang、Yanpeng Liu、Jinyi Xu
DOI:10.1080/00397911.2017.1402348
日期:2020.2.1
Abstract The DABCO-catalyzed [2 + 2] annulation of allenoates with trifluoroketones could be expanded to [4 + 2] annulation to synthesize trifluoromethylated dihydropyrans with trifluoromethyl oxadienes as the electrophilic annulation partners. GRAPHICAL ABSTRACT