- Design and synthesis of a trifunctional chiral porphyrin with C2 symmetry as a chiral recognition host for amino acid esters
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An intrinsic chiral recognition host, (R,R)- or (S.S)-[trans-5,15-bis(2-hydroxyphenyl)-10-{2,6-bis((methoxycarbonyl)m ethyl)phenyl}-2,3,17,18-tetraethylporphyrinato]zinc(II) (1), was synthesized by the coupling between (3,3',4,4'-tetraethyl-5,5'-bis(α-hyd
- Mizutani, Tadashi,Ema, Tadashi,Tomita, Takashi,Kuroda, Yasuhisa,Ogoshi, Hisanobu
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p. 4240 - 4250
(2007/10/02)
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- Directed Ortho Lithiation of Isophthalonitrile. New Methodology for the Synthesis of 1,2,3-Trisubstituted Benzenes
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The lithiation of 1,3-dicyanobenzene with lithium diisopropylamide occurs in high yield, regiospecifically at the 2-position, to give aryllithium species stable at temperatures below -90 deg C.
- Krizan, Timothy D.,Martin, J. C.
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p. 2681 - 2682
(2007/10/02)
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- Syntheses of Dihydropyrenes with Functionality in the Cavity of the ?-Electron Cloud
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The cyano group is shown to be a good group for directing ortho lithiation and, with 2,6-dicyanotoluene as starting material, ortho lithiation provides easy access to a variety of 1,2,3-trisubstituted benzene derivatives.The use of such derivatives in the standard thiacyclophane synthesis of dihydropyrenes has provided in good yield trans-15-(4'-butenyl)-16-methyldihydropyrene (14a) and trans-15-(methoxyethyl)-16-methyldihydropyrene (14b), the first examples of dihydropyrenes having functionality within the cavity of the aromatic ?-electron cloud.
- Mao, Yuh-lin,Boekelheide, Virgil
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p. 2746 - 2749
(2007/10/02)
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