Remote steric effects of C2-symmetric planar-chiral terpyridine ligands on copper-catalyzed asymmetric cyclopropanation reactions

Nanako Mugishima; Nobuhiro Kanomata; Norihiko Akutsu; Hironobu Kubota

doi:10.1016/j.tetlet.2015.02.103

Remote steric effects of C₂-symmetric planar-chiral terpyridine ligands on copper-catalyzed asymmetric cyclopropanation reactions

Nanako Mugishima, Nobuhiro Kanomata^*, Norihiko Akutsu, Hironobu Kubota

^*この研究の対応する著者

先進理工学部

研究成果: Article › 査読

8 被引用数 (Scopus)

抄録

A series of enantioselective cyclopropanation reactions of substituted alkenes with diazoacetates was investigated in the presence of Cu(OTf)₂ with C₂-symmetric planar-chiral bridged 2,2′:6′,2″-terpyridines. Planar-chiral terpyridine-copper complexes exhibited moderate diastereomeric excesses with good enantioselectivities of cis-cyclopropane products in catalytic asymmetric cyclopropanation reactions of various styrene derivatives with ethyl diazoacetate. A remote steric effect was found to enhance enantioselectivity for the cyclopropanation induced by a sterically demanding substituent beyond the ansa-bridge of pyridinophane ligands on the other side of the reaction site as a relay of steric influences through flexible cyclophane bridges.

本文言語	English
ページ（範囲）	1898-1903
ページ数	6
ジャーナル	Tetrahedron Letters
巻	56
号	14
DOI	https://doi.org/10.1016/j.tetlet.2015.02.103
出版ステータス	Published - 2015 4月 1

ASJC Scopus subject areas

生化学
創薬
有機化学

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10.1016/j.tetlet.2015.02.103

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title = "Remote steric effects of C2-symmetric planar-chiral terpyridine ligands on copper-catalyzed asymmetric cyclopropanation reactions",

abstract = "A series of enantioselective cyclopropanation reactions of substituted alkenes with diazoacetates was investigated in the presence of Cu(OTf)2 with C2-symmetric planar-chiral bridged 2,2′:6′,2″-terpyridines. Planar-chiral terpyridine-copper complexes exhibited moderate diastereomeric excesses with good enantioselectivities of cis-cyclopropane products in catalytic asymmetric cyclopropanation reactions of various styrene derivatives with ethyl diazoacetate. A remote steric effect was found to enhance enantioselectivity for the cyclopropanation induced by a sterically demanding substituent beyond the ansa-bridge of pyridinophane ligands on the other side of the reaction site as a relay of steric influences through flexible cyclophane bridges.",

keywords = "Asymmetric cyclopropanation, Copper carbenoid, Planar chirality, Remote steric effect, Terpyridine",

author = "Nanako Mugishima and Nobuhiro Kanomata and Norihiko Akutsu and Hironobu Kubota",

note = "Funding Information: The authors acknowledge financial support through a Waseda University Grant for Special Research Projects 2011B-180 . Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd. All rights reserved.",

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AU - Mugishima, Nanako

AU - Kanomata, Nobuhiro

AU - Akutsu, Norihiko

AU - Kubota, Hironobu

N1 - Funding Information: The authors acknowledge financial support through a Waseda University Grant for Special Research Projects 2011B-180 . Publisher Copyright: © 2015 Elsevier Ltd. All rights reserved.

PY - 2015/4/1

Y1 - 2015/4/1

N2 - A series of enantioselective cyclopropanation reactions of substituted alkenes with diazoacetates was investigated in the presence of Cu(OTf)2 with C2-symmetric planar-chiral bridged 2,2′:6′,2″-terpyridines. Planar-chiral terpyridine-copper complexes exhibited moderate diastereomeric excesses with good enantioselectivities of cis-cyclopropane products in catalytic asymmetric cyclopropanation reactions of various styrene derivatives with ethyl diazoacetate. A remote steric effect was found to enhance enantioselectivity for the cyclopropanation induced by a sterically demanding substituent beyond the ansa-bridge of pyridinophane ligands on the other side of the reaction site as a relay of steric influences through flexible cyclophane bridges.

AB - A series of enantioselective cyclopropanation reactions of substituted alkenes with diazoacetates was investigated in the presence of Cu(OTf)2 with C2-symmetric planar-chiral bridged 2,2′:6′,2″-terpyridines. Planar-chiral terpyridine-copper complexes exhibited moderate diastereomeric excesses with good enantioselectivities of cis-cyclopropane products in catalytic asymmetric cyclopropanation reactions of various styrene derivatives with ethyl diazoacetate. A remote steric effect was found to enhance enantioselectivity for the cyclopropanation induced by a sterically demanding substituent beyond the ansa-bridge of pyridinophane ligands on the other side of the reaction site as a relay of steric influences through flexible cyclophane bridges.

KW - Asymmetric cyclopropanation

KW - Copper carbenoid

KW - Planar chirality

KW - Remote steric effect

KW - Terpyridine

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