Helaja J - Search Results

1

Novel crown ether and salen metal chelation driven molecular pincers.

Abe AM, Helaja J, Koskinen AM. Abe AM, et al. Among authors: helaja j. Org Lett. 2006 Sep 28;8(20):4537-40. doi: 10.1021/ol061726o. Org Lett. 2006. PMID: 16986944

2

Locked conformations for proline pyrrolidine ring: synthesis and conformational analysis of cis- and trans-4-tert-butylprolines.

Koskinen AM, Helaja J, Kumpulainen ET, Koivisto J, Mansikkamäki H, Rissanen K. Koskinen AM, et al. Among authors: helaja j. J Org Chem. 2005 Aug 5;70(16):6447-53. doi: 10.1021/jo050838a. J Org Chem. 2005. PMID: 16050708

3

NH tautomerism in the natural chlorin derivatives.

Helaja J, Stapelbroek-Möllmann M, Kilpeläinen I, Hynninen PH. Helaja J, et al. J Org Chem. 2000 Jun 16;65(12):3700-7. doi: 10.1021/jo9918955. J Org Chem. 2000. PMID: 10864754

4

Hydrogen bond driven self-assembled C2-symmetric chlorin syn dimers; unorthodox models for chlorophyll 'special pairs' in photosynthetic reaction centres.

Nikkonen T, Haavikko R, Helaja J. Nikkonen T, et al. Among authors: helaja j. Org Biomol Chem. 2009 May 21;7(10):2046-52. doi: 10.1039/b819764d. Epub 2009 Mar 20. Org Biomol Chem. 2009. PMID: 19421441

5

Electronic regioselectivity of diarylalkynes in cobalt-mediated Pauson-Khand reaction: an experimental and computational study with para- and meta-substituted diarylalkynes and norbornene.

Fager-Jokela E, Muuronen M, Patzschke M, Helaja J. Fager-Jokela E, et al. Among authors: helaja j. J Org Chem. 2012 Oct 19;77(20):9134-47. doi: 10.1021/jo3016902. Epub 2012 Sep 28. J Org Chem. 2012. PMID: 22985418

6

Visible-Light-Photocatalyzed Reductions of N-Heterocyclic Nitroaryls to Anilines Utilizing Ascorbic Acid Reductant.

Todorov AR, Aikonen S, Muuronen M, Helaja J. Todorov AR, et al. Among authors: helaja j. Org Lett. 2019 May 17;21(10):3764-3768. doi: 10.1021/acs.orglett.9b01205. Epub 2019 May 8. Org Lett. 2019. PMID: 31066563 Free PMC article.

7

Phenanthrenequinone-Sensitized Photocatalytic Synthesis of Polysubstituted Quinolines from 2-Vinylarylimines.

Talvitie J, Alanko I, Bulatov E, Koivula J, Pöllänen T, Helaja J. Talvitie J, et al. Among authors: helaja j. Org Lett. 2022 Jan 14;24(1):274-278. doi: 10.1021/acs.orglett.1c03934. Epub 2021 Dec 20. Org Lett. 2022. PMID: 34928166 Free PMC article.

8

β-Cyclodextrin-NHC-Au(I)-Catalyzed Enantioconvergent 1,5-Enyne Cycloisomerizations.

Koohgard M, Enders L, Del Rio N, Li H, Moccia F, Khaled O, Bistri O, Helaja J, Sollogoub M, Mouriès-Mansuy V, Fensterbank L. Koohgard M, et al. Among authors: helaja j. Org Lett. 2024 Jul 12;26(27):5817-5821. doi: 10.1021/acs.orglett.4c02003. Epub 2024 Jul 1. Org Lett. 2024. PMID: 38949965

9

Tautomeric switching and metal-cation sensing of ligand-equipped 4-hydroxy-/4-oxo-1,4-dihydroquinolines.

Todorov AR, Nieger M, Helaja J. Todorov AR, et al. Among authors: helaja j. Chemistry. 2012 Jun 4;18(23):7269-77. doi: 10.1002/chem.201103868. Epub 2012 Apr 19. Chemistry. 2012. PMID: 22517539

10

Gold(III)-catalyzed enynamine-cyclopentadiene cycloisomerization with chirality transfer: an experimental and theoretical study indicating involvement of dual Au(III) push-pull assisted cis-trans isomerism.

Wirtanen T, Muuronen M, Melchionna M, Patzschke M, Helaja J. Wirtanen T, et al. Among authors: helaja j. J Org Chem. 2014 Nov 7;79(21):10269-83. doi: 10.1021/jo501905q. Epub 2014 Oct 27. J Org Chem. 2014. PMID: 25310618

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