Dicarboxylic acids imines, cyclic

Cyclic imines from dicarboxylic acid imides... [Pg.421]

Cyclic imines from dicarboxylic acids GOOH ... [Pg.514]

Cyclic imines from dicarboxylic acid imides s. 6, 103 isoindolines s. R. A. Schmidt,... [Pg.396]

Recently, Maruoka and coworkers have also developed an asymmetric inverse electron demand 1,3-dipolar cycloaddition of C,A -cyclic azomethine imines with fort-butyl vinyl ether catalyzed by a newly developed axially chiral dicarboxylic acid having diarylmethyl groups at the 3,3 -positions (Scheme 7.7) [18]. Based on this finding, the concept of the inverse electron demand umpolung 1,3-dipolar cycloaddition was introduced as a strategy for switching the regioselectivity of the cycloaddition from that of the titanium BINOLate-catalyzed normal electron demand 1,3-dipolar cycloaddition with enals (Table 7.3) by... [Pg.180]

Asymmetric inverse-electron-demand 1,3-dipolar cycloaddition of C,A-cyclic azomethine imines with c-rich dipolarophiles was accomplished with a high stereo-selectivity by using an axially chiral dicarboxylic catalyst (40)." The metal-free silicon Lewis-acid-catalysed 3-1-2-cycloadditions of A-acylhydrazones with cyclopentadiene provides a mild access to pyrazolidine derivatives in excellent... [Pg.457]