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Items: 1 to 20 of 176

1.

Chiral squaramides as highly enantioselective catalysts for Michael addition reactions of 4-hydroxycoumarins and 4-hydroxypyrone to beta,gamma-unsaturated alpha-keto esters.

Xu DQ, Wang YF, Zhang W, Luo SP, Zhong AG, Xia AB, Xu ZY.

Chemistry. 2010 Apr 12;16(14):4177-80. doi: 10.1002/chem.201000094. No abstract available.

PMID:
20229539
2.

Squaramide-catalyzed enantioselective Michael addition of masked acyl cyanides to substituted enones.

Yang KS, Nibbs AE, Türkmen YE, Rawal VH.

J Am Chem Soc. 2013 Oct 30;135(43):16050-3. doi: 10.1021/ja409012q. Epub 2013 Oct 17.

3.
4.

Gold(III)-catalyzed tandem conjugate addition/annulation of 4-hydroxycoumarins with α,β-unsaturated ketones.

Liu Y, Zhu J, Qian J, Jiang B, Xu Z.

J Org Chem. 2011 Nov 4;76(21):9096-101. doi: 10.1021/jo201342m. Epub 2011 Oct 7.

PMID:
21950409
5.

Highly enantioselective Michael addition of malonates to beta,gamma-unsaturated alpha-ketoesters catalyzed by chiral N,N'-dioxide-Yttrium(III) complexes with convenient procedure.

Zhou L, Lin L, Wang W, Ji J, Liu X, Feng X.

Chem Commun (Camb). 2010 May 28;46(20):3601-3. doi: 10.1039/c002208j. Epub 2010 Apr 8.

PMID:
20379595
6.

Enantioselective Michael reaction of α-alkyl-β-keto esters and enones under multifunctional catalysis.

Yang J, Li W, Jin Z, Liang X, Ye J.

Org Lett. 2010 Nov 19;12(22):5218-21. doi: 10.1021/ol102256v. Epub 2010 Oct 18.

PMID:
20954724
7.

Organocatalytic asymmetric Michael-type reaction between β,γ-unsaturated α-keto ester and α-nitro ketone.

Li P, Chan SH, Chan AS, Kwong FY.

Org Biomol Chem. 2011 Dec 7;9(23):7997-9. doi: 10.1039/c1ob06191g. Epub 2011 Oct 3.

PMID:
21969174
8.

Chiral scandium catalysts for enantioselective Michael reactions of beta-ketoesters.

Ogawa C, Kizu K, Shimizu H, Takeuchi M, Kobayashi S.

Chem Asian J. 2006 Jul 17;1(1-2):121-4.

PMID:
17441046
9.

Highly enantioselective aldol reaction of acetone with β,γ-unsaturated α-keto esters promoted by simple chiral primary-tertiary diamine catalysts.

Peng L, Wang LL, Bai JF, Jia LN, Guo YL, Luo XY, Wang FY, Xu XY, Wang LX.

Org Biomol Chem. 2011 Jul 7;9(13):4774-7. doi: 10.1039/c1ob05607g. Epub 2011 May 26.

PMID:
21614388
10.

Enantioselective assembly of substituted dihydropyrones via organocatalytic reaction in water media.

Wang J, Yu F, Zhang X, Ma D.

Org Lett. 2008 Jun 19;10(12):2561-4. doi: 10.1021/ol800835m. Epub 2008 May 14.

PMID:
18476713
11.

Chiral magnesium(II) binaphtholates as cooperative Brønsted/Lewis acid-base catalysts for the highly enantioselective addition of phosphorus nucleophiles to α,β-unsaturated esters and ketones.

Hatano M, Horibe T, Ishihara K.

Angew Chem Int Ed Engl. 2013 Apr 22;52(17):4549-53. doi: 10.1002/anie.201300938. Epub 2013 Mar 13.

PMID:
23495237
12.

A Lewis acid-catalyzed formal [3 + 3] cycloaddition of alpha,beta-unsaturated aldehydes with 4-hydroxy-2-pyrone, diketones, and vinylogous esters.

Kurdyumov AV, Lin N, Hsung RP, Gullickson GC, Cole KP, Sydorenko N, Swidorski JJ.

Org Lett. 2006 Jan 19;8(2):191-3.

PMID:
16408872
13.

Highly enantioselective synthesis of gamma-hydroxy-alpha,beta-acetylenic esters catalyzed by a beta-sulfonamide alcohol.

Lin L, Jiang X, Liu W, Qiu L, Xu Z, Xu J, Chan AS, Wang R.

Org Lett. 2007 Jun 7;9(12):2329-32. Epub 2007 May 11.

PMID:
17497796
14.

Diastereoselectivity switch in cooperatively catalyzed three-component reactions of an aryldiazoacetate, an alcohol, and a β,γ-unsaturated α-keto ester.

Ji J, Zhang X, Zhu Y, Qian Y, Zhou J, Yang L, Hu W.

J Org Chem. 2011 Jul 15;76(14):5821-4. doi: 10.1021/jo102423c. Epub 2011 Jun 13.

PMID:
21667947
15.

Enantioselective Diels-Alder reaction of simple alpha,beta-unsaturated ketones with a cinchona alkaloid catalyst.

Singh RP, Bartelson K, Wang Y, Su H, Lu X, Deng L.

J Am Chem Soc. 2008 Feb 27;130(8):2422-3. doi: 10.1021/ja078251w. Epub 2008 Feb 6. No abstract available.

PMID:
18251543
16.

N,N'-diarylsquaramides: general, high-yielding synthesis and applications in colorimetric anion sensing.

Rostami A, Colin A, Li XY, Chudzinski MG, Lough AJ, Taylor MS.

J Org Chem. 2010 Jun 18;75(12):3983-92. doi: 10.1021/jo100104g.

PMID:
20486682
17.

Lewis acid-catalyzed enantioselective hydroxylation reactions of oxindoles and beta-keto esters using DBFOX ligand.

Ishimaru T, Shibata N, Nagai J, Nakamura S, Toru T, Kanemasa S.

J Am Chem Soc. 2006 Dec 27;128(51):16488-9.

PMID:
17177383
18.

Asymmetric intramolecular oxa-Michael addition of activated alpha,beta-unsaturated ketones catalyzed by a chiral N,N'-dioxide nickel(II) complex: highly enantioselective synthesis of flavanones.

Wang L, Liu X, Dong Z, Fu X, Feng X.

Angew Chem Int Ed Engl. 2008;47(45):8670-3. doi: 10.1002/anie.200803326. No abstract available.

PMID:
18846524
19.

Highly enantioselective phosphination and hydrophosphonylation of azomethine imines: using chiral squaramide as a hydrogen bonding organocatalyst.

Kong LP, Li NK, Zhang SY, Chen X, Zhao M, Zhang YF, Wang XW.

Org Biomol Chem. 2014 Nov 21;12(43):8656-70. doi: 10.1039/c4ob01472c.

PMID:
25252601
20.

Chiral primary-secondary diamines catalyzed Michael-aldol-dehydration reaction between benzoylacetates and alpha,beta-unsaturated ketones: highly enantioselective synthesis of functionalized chiral cyclohexenones.

Yang YQ, Chai Z, Wang HF, Chen XK, Cui HF, Zheng CW, Xiao H, Li P, Zhao G.

Chemistry. 2009 Dec 14;15(48):13295-8. doi: 10.1002/chem.200901541. No abstract available.

PMID:
19908264
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