Organic Reactions in the Solid State: Reactions of Enclathrated 3,4-Epoxycyclopentanone (=6-Oxobicyclo[3.1.0]hexan-3-one) in Tri-o-thymotide and Absolute Configuration of 4-Hydroxy- and 4-Chlorocyclopent-2-en-1-one

Asymmetric synthesis starting from an achiral material and in the absence of any external chiral agent has long been an intriguing challenge to chemists [1] and is also central to the origin of optical activity in Nature.[2] Stereospecific solid-state chemical reactions of chiral crystals formed by spontaneous crystallization of achiral materials are defined as "absolute" asymmetric synthesis, and most of the successful examples of such transformations involve photochemical reactions. [1,3] If the molecular chirality generated by chiral crystallization is retained even after the crystals are dissolved in a solvent, the "frozen" chirality is effectively transferred to the optically active products by various types of asymmetric reactions, besides the solid-state photochemical reaction. [4,5] Herein, we provide the first example of an asymmetric intermolecular photochemical reaction in solution through transfer of the chirality generated by chiral crystallization of an achiral naphthamide.2-Alkoxy-1-naphthamides 1 were chosen to perform this asymmetric synthesis because the bond rotation between the naphthalene ring and the C=O(NR 1 R 2 ) group corresponds to enantiomerization of 1, and the rate is considerably affected by the substituents on both the naphthalene ring and the amide group (Scheme 1).[6] Naphthamides comprising a bulky Scheme 1. Enantiomerization of naphthamides 1 a, b upon rotation about the naphthalene-C( = O) bond.

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Asymmetric Photocycloaddition in Solution of a Chiral Crystallized Naphthamide

Sakamoto

Unosawa

Kobaru

et al. 2005

Angewandte Chemie

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A Different Approach to Enantioselective Organic Synthesis: Absolute Asymmetric Synthesis of Organometallic Reagents

et al. 2009

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Asymmetric Photocycloaddition in Solution of a Chiral Crystallized Naphthamide

et al. 2005

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Organic Reactions in the Solid State: Reactions of Enclathrated 3,4-Epoxycyclopentanone (=6-Oxobicyclo[3.1.0]hexan-3-one) in Tri-o-thymotide and Absolute Configuration of 4-Hydroxy- and 4-Chlorocyclopent-2-en-1-one

Cited by 17 publications

References 9 publications

Asymmetric Photocycloaddition in Solution of a Chiral Crystallized Naphthamide

Asymmetric Photocycloaddition in Solution of a Chiral Crystallized Naphthamide

A Different Approach to Enantioselective Organic Synthesis: Absolute Asymmetric Synthesis of Organometallic Reagents

Asymmetric Photocycloaddition in Solution of a Chiral Crystallized Naphthamide

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