Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Hyun‐Joon Ha"'
Publikováno v:
Frontiers in Chemistry, Vol 12 (2024)
Externí odkaz:
https://doaj.org/article/193770eaa5b444798ecd2035ce07753c
Autor:
Hyun-Joon Ha
Publikováno v:
Frontiers in Chemistry, Vol 11 (2023)
The use of organocatalysts and a pot economy has strengthened recent organic syntheses. Synthetic methodologies may be applicable in laboratory preparation or in the industrial production of valuable organic compounds. In most cases, synthetic challe
Externí odkaz:
https://doaj.org/article/6e7a200627f24145990b39d682facdad
Autor:
Nikhil Srivastava, Hyun-Joon Ha
Publikováno v:
Frontiers in Chemistry, Vol 11 (2023)
Aziridine had different regioselective ring openings depending on the functional group of its alkyl substituent. In the case of the alkyl group bearing γ-ketone at the C2 substituent of aziridine, the ring opening by the hydroxy nucleophile from H2O
Externí odkaz:
https://doaj.org/article/3b2cf511359a42a99f13880bfc0e8556
Publikováno v:
Molecules, Vol 27, Iss 20, p 6869 (2022)
Multi-substituted pyrroles are synthesized from regiospecific aziridine ring-opening and subsequent intramolecular cyclization with a carbonyl group at the γ-position in the presence of Lewis acid or protic acid. This method is highly atom economica
Externí odkaz:
https://doaj.org/article/0da97ba1cd3f4ff6854dafadff27d82c
Publikováno v:
ACS Omega, Vol 2, Iss 11, Pp 7525-7531 (2017)
Externí odkaz:
https://doaj.org/article/423d22761f6843858fce8552243f0a35
Autor:
Hyun-Joon Ha
Publikováno v:
Frontiers in Chemistry, Vol 7 (2019)
Externí odkaz:
https://doaj.org/article/15e34a674c534b2ead875e8ab6aa0af8
Publikováno v:
Frontiers in Chemistry, Vol 7 (2019)
Alkylative ring-opening of bicyclic aziridinium ion generated from 4-hydroxybutylaziridine with organocopper reagent was achieved successfully to afford 2-alkylsubstituted piperidine in high or moderate yield. This method allowed carbon-carbon bond f
Externí odkaz:
https://doaj.org/article/5dc07021c5c04edfb74a038bdec27db1
Autor:
Hyun-Joon Ha
Publikováno v:
Molecules, Vol 26, Iss 6, p 1525 (2021)
Aziridine is a nitrogen-containing three-membered ring with similar ring strain energy as other three-membered ring compounds, including cyclopropane and oxirane [...]
Externí odkaz:
https://doaj.org/article/77e9be7a2a524161a62dcc5ada1be466
Publikováno v:
Molecules, Vol 26, Iss 6, p 1703 (2021)
In this study, the highly strained three-membered aziridine ring was successfully activated as the aziridinium ion by alkylation of the ring nitrogen with a methyl, ethyl or allyl group, which was followed by ring opening with external nucleophiles s
Externí odkaz:
https://doaj.org/article/3ffb894d7e3d4c3a9160e4cbfe08815e
Autor:
Jala Ranjith, Hyun-Joon Ha
Publikováno v:
Molecules, Vol 26, Iss 6, p 1774 (2021)
Nonactivated aziridine with an electron-donating group at the ring nitrogen should be activated to an aziridinium ion prior to being converted to cyclic and acyclic nitrogen-containing molecules. This review describes ways to generate aziridinium ion
Externí odkaz:
https://doaj.org/article/3d031e039a8c4a46982a4b3d70c40821