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26.9.1.1.9.2 Variation 2: Horner–Wittig Reaction of Oxophosphine Oxides

DOI: 10.1055/sos-SD-026-00987

Marsden, S. P.Science of Synthesis, (2005261082.

The reaction of anions of oxophosphine oxides with carbonyl compounds to deliver enones via a HornerWittig reaction has been remarkably underused. One application has been in the synthesis of unsaturated β-oxo esters such as 198 (Nazarov reagents), which are useful building blocks in Robinson annulations and heterocyclic synthesis and can be accessed directly from enals by treatment with the dianions of β-oxo ester phosphine oxides 197 (Scheme 38).[‌175‌]

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