scheme30

Scheme 30. Organocatalytic 1,3-dipolar cyclization of butyrolactone-derived cyclic imino esters 57 and alkylidene pyrazolones 60. This figure is used with permission from Wiley-VCH Verlag[89].
Scheme 30. Organocatalytic 1,3-dipolar cyclization of butyrolactone-derived cyclic imino esters 57 and alkylidene pyrazolones 60. This figure is used with permission from Wiley-VCH Verlag[89].
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