Organocatalytic Desymmetrisation of Fittig’s Lactones: Deuterium as a Reporter Tag for Hidden Racemisation

Péter Spránitz; Petra Sőregi; Bence Béla Botlik; Máté Berta; Tibor Soós

doi:10.1055/s-0037-1611655

Synthesis, Table of Contents

CC BY-ND-NC 4.0 · Synthesis 2019; 51(05): 1263-1272
DOI: 10.1055/s-0037-1611655

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Organocatalytic Desymmetrisation of Fittig’s Lactones: Deuterium as a Reporter Tag for Hidden Racemisation

Péter Spránitz

,

Petra Sőregi

,

Bence Béla Botlik

,

Máté Berta

,

Tibor Soós *

Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2A, 1117 Budapest, Hungary Email: soos.tibor@ttk.mta.hu

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Abstract

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Published as part of the 50 Years SYNTHESIS – Golden Anniversary Issue

Abstract

Highly enantioselective desymmetrisation of Fittig’s lactones with alcohols is promoted by bifunctional cinchona squaramides. The reactions were carried out with monodeuterated methanol to detect possible hidden racemisation of the stereogenic centre. Current evidence suggests that racemisation was not a relevant process for most substrates; partial erosion of enantioselectivity was only detected with ortho-substituted aryl derivates. The resultant glutaric acid derivatives possess a scaffold that is common in natural products and the compounds are also useful chiral building blocks for further synthetic endeavours.

Key words

Fittig’s lactone - desymmetrization - bislactone acylal - bifunctional organocatalysis - racemization

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References

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