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12.1.1.1.1.1 Method 1: From [(Aryldiazenyl)(methoxycarbonyl)methylene]triphenylphosphoranes and Dichlorocarbene

DOI: 10.1055/sos-SD-012-00002

Stanovnik, B.; Svete, J.Science of Synthesis, (20021221.

[(Aryldiazenyl)(methoxycarbonyl)methylene]triphenylphosphoranes react under phase-transfer reaction conditions with 2 equivalents of dichlorocarbene to form methyl 1-aryl-5-chloropyrazole-3-carboxylates 4 (Scheme 6).[‌74‌]

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