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Paraconic ester

The following mechanism for the reaction has been suggested. It postulates formation of an intermediate paraconic ester (A) the irreversible alkoxlde cleavage of this cyclic ester drives the reaction to completion ... [Pg.920]

Instead of epoxides carbonyl compounds may be used as electrophiles to generate the y-hydroxy carboxylic acid intermediate. In the classical Stobbe reaction (equation 79) succinic esters are deprotonated and treated with aldehydes or ketones to form, via the unstable adduct (211), the paraconic ester (212). [Pg.355]

Functionalized y-acyloxy-a,yS-unsaturated esters provided yet another versatile strategy towards paraconic acids as exemplified with the synthesis of protolichesterinic acid ((-i-)-lO) (Scheme 22) [60]. The prerequisite precur-... [Pg.63]

The electrochemical rearrangement of paraconic acids (CIV) [Eq. (52)], y-carboxy-3-lactones (CVI) [Eq. (53)] [168], and /6-keto carboxylic acid ethylene acetals (CVIII) [Eq. (54)] [169,170] has been known to proceed smoothly. y-Keto carboxylic acids (CX) and acetals (CXII) undergo decarboxylative rearrangement to afford esters (CXI and XCIII) as in Eqs. (55) and (56) [171,172]. [Pg.535]

The synthesis of paraconic acids described above starts from succinic acid the Stobbe condensation uses succinic esters and their substitution products ... [Pg.986]

See other pages where Paraconic ester is mentioned: [Pg.120]    [Pg.120]    [Pg.356]    [Pg.357]    [Pg.356]    [Pg.357]    [Pg.89]    [Pg.120]    [Pg.120]    [Pg.356]    [Pg.357]    [Pg.356]    [Pg.357]    [Pg.89]    [Pg.45]    [Pg.55]    [Pg.64]    [Pg.68]    [Pg.8]    [Pg.486]    [Pg.14]    [Pg.357]    [Pg.105]    [Pg.337]    [Pg.619]    [Pg.619]    [Pg.339]    [Pg.438]    [Pg.478]    [Pg.252]   


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Paraconic acid ester

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