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. 2021 Mar 25;121(12):6744–6776. doi: 10.1021/acs.chemrev.0c01076

Scheme 19. Phosphine-Catalyzed Intramolecular Amino-yne Reaction to Form Nitrogen Heterocycles.

Scheme 19

(a) Synthesis of saturated heterocycles via a double Michael addition using a diphosphine catalyst;192 (b) synthesis of quinolines using triphenyl phosphine.194