Abstract
The reactive 1:1 adduct produced by the addition of trimethyl phosphite to dialkyl acetylenedicarboxylates protonated by isoquinolinium or quinolinium bromides to afford isoquinolinium or quinolinium ylides and vinyl phosphonium bromides. 1,3-Dipolar cycloaddition reaction between isoquinolinium or quinolinium ylides and vinyl phosphonium bromides, followed by elimination of dimethyl phosphite and subsequent air-oxidation led to benzoindolizine derivatives in good yields.
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