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Synthesis of 13 C labelled unsymmetrically substituted maleic anhydrides

✍ Scribed by L. Breau; M. M. Kayser

Book ID
102368404
Publisher
John Wiley and Sons
Year
1988
Tongue
French
Weight
398 KB
Volume
25
Category
Article
ISSN
0022-2135

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✦ Synopsis

Methylmaleic (citraconic) and ethoxymaleic anhydrides labelled with 1 3 C a t C-4, and phenylmaleic anhydride labelled at C-1 were prepared in excellent yields from inexpensive starting materials. methodology described here can be applied i n a synthesis of a variety of substituted maleic anhydrides. The We wish to report highly efficient syntheses o f Carbon-13 labelled maleic anhydrides. into the desired position in the unsyrqnetrically substituted anhydride rings. Two different routes were developed to introduce l 3 C 0 H 0 I -0 RyJ H 0 u 2 R-CHj 3 R=EtO CI 2-Phenylmaleic anhydride -1 labelled at C-1 was prepared as shown in scheme 1. 2-Methylmaleic anhydride 2 and 2-ethoxymaleic anhydride -3 marked 0362-4803/88K)30M1-12~.~ @ 1988 by John Wicy & Sons. Ltd.

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