全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
中外文文献  中文文献  外文文献
作者:... Hongjie Pan , Hua Tian , Yian Shi
来源:[J].Science China Chemistry(IF 1.327), 2018, Vol.61 (6), pp.656-659Springer
摘要:Abstract(#br)Phosphine oxide-Sc(OTf) 3 catalyzed regio- and enantioselective bromoaminocyclization of tri -substituted allyl N -tosylcarbamates is described. A wide variety of optically active tertiary 5-bromo-1,3-oxazinan-2-ones can be obtained with high regio-and enantioselecti...
作者:... Xingao Peng , Richard G. Cornwall , Yian Shi
来源:[J].Org. Lett., 2013, Vol.15 (16), pp.4210鈥?213ACS
摘要:No product was formed without additional ligand (Table 1, entry 7). ... The nature of the ligand has a dramatic effect on the product yield. ... Among the ligands examined, PPh3 gave the highest yield (Table 1, entry 8), and essentially no product was obtained with P(o-tolyl)3, d...
作者:... Haining Wang , Deshun Huang , Yian Shi
来源:[J].Tetrahedron(IF 2.803), 2012, Vol.68 (12), pp.2728-2735Elsevier
摘要:Abstract(#br)This paper describes Brønsted acid catalyzed enantioselective oxysulfenylation and oxyselenenylation of olefins. Enantiomerically enriched tetrahydrofurans are formed with up to 63% ee with dibenzoyl- d -tartaric acid and its derivatives as catalyst. Chiral β-ca...
作者:... Haining Wang , Deshun Huang , Yian Shi
来源:[J].Tetrahedron(IF 2.803), 2012, Vol.68 (47), pp.9853-9859Elsevier
摘要:Abstract(#br)This paper describes efficient acid-catalyzed regioselective sulfamination of γ-amino–alkenes to form pyrrolidines and stereoselective rearrangement of pyrrolidines to piperidines. A possible reaction mechanism has been proposed.
作者:... Xiao Xiao , Haining Wang , Yian Shi
来源:[J].Tetrahedron(IF 2.803), 2012, Vol.68 (34), pp.6862-6867Elsevier
摘要:Abstract(#br)This paper describes the effect of benzyl amine on the base-catalyzed transamination of α-keto esters. Among various benzyl amines examined, o -HOC 6 H 4 CH 2 NH 2 was found to be highly effective for the reaction, affording a wide variety of α-amino esters in g...
作者:Lianhe Shu , Yian Shi
来源:[J].Tetrahedron Letters(IF 2.397), 2004, Vol.45 (43), pp.8115-8117Elsevier
摘要:Abstract(#br)Asymmetric epoxidation of substituted cis -β-methylstyrenes using N -aryl substituted oxazolidinone-containing ketones as catalysts shows that substituents on the phenyl group of the olefin have significant positive effects on the enantioselectivity of the epoxi...
作者:... Haifeng Du , Kai Li , Yian Shi
来源:[J].Tetrahedron Letters(IF 2.397), 2005, Vol.46 (16), pp.2737-2740Elsevier
摘要:Abstract(#br)This paper describes a catalytic asymmetric cyclopropanation system for unfunctionalized olefins using readily available dipeptide N -Boc- l -Val- l -Pro-OMe ( 1 ) as ligand.
作者:... Yong Tu , Hongwu Yu , Yian Shi
来源:[J].Tetrahedron Letters(IF 2.397), 1998, Vol.39 (43), pp.7819-7822Elsevier
摘要:Abstract(#br)High enantioselectivities have been obtained for asymmetric epoxidation of enol silyl ethers and asters using a fructose-derived chiral ketone as catalyst and Oxone as oxidant.
作者:Zhiqiang Yang , Jon C. Lorenz , Yian Shi
来源:[J].Tetrahedron Letters(IF 2.397), 1998, Vol.39 (47), pp.8621-8624Elsevier
摘要:Abstract(#br)An organozinc species RXZnCH 2 I generated by reacting Zn(CH 2 I) 2 with RXH was found to be an efficient reagent for the cyclopropanation of olefins at room temperature. A 50.7% ee was obtained for the cyclopropanation of trans -β-methylstyrene when a chiral al...
作者:Thomas A. Ramirez , Baoguo Zhao , Yian Shi
来源:[J].Tetrahedron Letters(IF 2.397), 2010, Vol.51 (14), pp.1822-1825Elsevier
摘要:Abstract(#br)A dehydrogenation method using Cu(I) and either N , N -di- tert -butylthiadiaziridine 1,1-dioxide or N , N -di- tert -butyldiaziridinone is reported. The dehydrogenation allows a facile introduction of C–C double bond(s) into various carbocycles and heterocycles...

我们正在为您处理中,这可能需要一些时间,请稍等。

资源合作:cnki.scholar@cnki.net, +86-10-82896619   意见反馈:scholar@cnki.net

×