C. IWATA

Desymmetrization

Chiral auxiliary

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Citations (15)

CAN-mediated tandem 5-exo-cyclisation of tertiary aminocyclopropanes: novel accelerative effect of an N-benzyl group for oxidative ring-opening

Chemical Communications (1998)

Yoshiji Takemoto Saori Yamagata Syun‐ichirou Furuse C. IWATA

Treatment of tertiary cyclopropylamines with cerium(IV) ammonium nitrate (CAN) gave ring-opened ketones and/or bicyclic secondary amines via an oxidative cyclopropane cleavage followed by a hydrogen abstraction or 5-exo radical cyclization: an N-benzyl group plays a crucial role in these reactions.

Cyclopropane

Tandem

Cleavage (geology)

10.1039/a800125a

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Citations (41)

Enantioselective Cu-catalyzed 1,4-addition of Me3Al to a 4,4-disubstituted cyclohexa-2,5-dienone: Novel effect of trialkylsilylOTf on enantioselectivity

Tetrahedron Asymmetry (1996)

Yoshiji Takemoto S. KURAOKA Naoko Hamaue C. IWATA

Conjugate

10.1016/0957-4166(96)00100-0

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Citations (47)

Anomalous transformation of tricyclo[3.3.0.0^2,8]octan-3-ones into bicyclo[3.2.1]octan-3-ones, a novel route to (±)-quadrone

Journal of the Chemical Society Chemical Communications (1987)

Takeshi Imanishi M. MATSUI Masayuki Yamashita C. IWATA

A novel route to (±)-quadrone (5) has been developed via an anomalous C(1)–C(2) bond cleavage of 4-benzyloxymethyl-7,7-dimethyl-3-oxotricyclo[3.3.0.02,8]octane-5- acetic acid (11) by an intramolecular participation of the carboxy group.

10.1039/c39870001802

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Citations (14)

ChemInform Abstract: Utility of a Diene-Tricarbonyliron Complex as Mobile Chiral Auxiliary: Iterative Use for Constructing Contiguous Chiral Centers.

ChemInform (1998)

Yoshiji Takemoto Yuya Baba Naoki Yoshikawa C. IWATA Takashi Tanaka

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Diene

10.1002/chin.199850268

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Citations (0)

1,6-Asymmetric Induction by Reductive Acetal Cleavage of a Bicyclic Acetal Using a Sulfinyl Chiral Auxiliary.

Chemical and Pharmaceutical Bulletin (1998)

Naoyoshi Maezaki Takeshi Shogaki Tuneaki IMAMURA Katsuya TOKUNO Kazumi Ohkubo

A new synthetic route to a chiral 2, 5-disubstituted tetrahydropyran has been achieved by asymmetric reductive acetal cleavage of a bicyclic acetal having a chiral sulfinyl group as a chiral auxiliary. It was found that the (5S)-tetrahydropyran was obtained preferentially (up to 96 : 4) with an R-sulfinyl chiral auxiliary by an efficient 1, 6-asymmetric induction from sulfinyl chirality to the prochiral center on the bicyclic ring.

Tetrahydropyran

Asymmetric induction

Chiral auxiliary

Cleavage (geology)

Chirality

10.1248/cpb.46.837

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Citations (4)

ChemInform Abstract: Diastereoselective Total Synthesis of (‐)‐Solavetivone via a Copper‐ Catalyzed Conjugate Addition of Me3Al to a Cyclohexa‐2,5‐dienone Intermediate.

ChemInform (1997)

Yoshiji Takemoto S. KURAOKA Taiichi Ohra Yasuhiro Yonetoku C. IWATA

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Conjugate

10.1002/chin.199718227

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Citations (0)

Regio- and Stereocontrolled Iodocyclocarbamation of N-Carbamoyl-2,4-Dienylamine derivatives

Synlett (1995)

Yoshiji Takemoto Jun Takeuchi Eiki Matsui C. IWATA

Mild iodo-catalyzed cyclocarbamations of N-benzyl-N-carbomethoxy-1-substituted-2,4-pentadienylamines were developed. The reactions proceed regio- and stereoselectively, giving rise to 4,5-trans-oxazolidin-2-ones bearing (E)-propenyl iodide at the C5 position as major products.

10.1055/s-1995-5073

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Citations (3)

ChemInform Abstract: Novel Asymmetric Desymmetrization of meso-1,2-Diols via Diastereoselective β-Elimination of Chiral α-Arylsulfinyl Acetals.

ChemInform (1996)

Naoyoshi Maezaki M. SOEJIMA Mayu Takeda Ai Sakamoto Y. MATSUMORI

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Desymmetrization

10.1002/chin.199635041

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Citations (0)

Photochemical Enolization of ortho-Alkylbenzaldehydes

Chemical and Pharmaceutical Bulletin (1974)

Zen-ichi Horii YOSHIYUKI HORI FUMIE KANAZAWA C. IWATA

Irradiation of o-alkylbenzaldehyde, i.e., o-methylbenzaldehyde and o-benzylbenzaldehyde gave the corresponding enoles, which gave dimethyl naphthalene-2, 3-dicarboxylates, 4-hydroxy-1-phenyl-1, 2, 3, 4-tetrahydronaphthalene-2, 3-dicarboxylic acid γ-lactones and phthalides by reaction with dimethyl acetylenedicarboxylate, maleic anhydride and oxygen, respectively.

Dimethyl acetylenedicarboxylate

Keto–enol tautomerism

Maleic anhydride

Dicarboxylic acid

10.1248/cpb.22.736

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Citations (7)

Papers

Citation

H-Index

i-10 index

Papers

Citation

H-Index

i-10 index