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2 article(s) from Toy, Patrick H

Catalytic Wittig and aza-Wittig reactions

Zhiqi Lao and
Patrick H. Toy

Beilstein J. Org. Chem. 2016, 12, 2577–2587, doi:10.3762/bjoc.12.253

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Graphical Abstract

Scheme 1: Prototypical Wittig reaction involving in situ phosphonium salt and phosphonium ylide formation.

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Scheme 2: Bu₃As-catalyzed Wittig-type reactions.

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Scheme 3: Ph₃As-catalyzed Wittig-type reactions using Fe(TCP)Cl and ethyl diazoacetate for arsonium ylide gen...

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Figure 1: Recyclable polymer-supported arsine for catalytic Wittig-type reactions.

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Scheme 4: Bu₂Te-catalyzed Wittig-type reactions.

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Scheme 5: Polymer-supported telluride catalyst cycling.

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Scheme 6: Stable and odourless telluronium salt pre-catalyst for Wittig-type reactions.

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Scheme 7: Phosphine-catalyzed Wittig reactions.

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Figure 2: Various phosphine oxides used as pre-catalysts.

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Scheme 8: Enantioselective catalytic Wittig reaction reported by Werner.

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Scheme 9: Base-free catalytic Wittig reactions reported by Werner.

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Scheme 10: Catalytic Wittig reactions reported by Lin.

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Scheme 11: Catalytic Wittig reactions reported by Plietker.

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Scheme 12: Prototypical aza-Wittig reaction involving in situ iminophosphorane formation.

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Scheme 13: First catalytic aza-Wittig reaction reported by Campbell.

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Scheme 14: Intramolecular catalytic aza-Wittig reactions reported by Marsden.

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Scheme 15: Catalytic aza-Wittig reactions in 1,4-benzodiazepin-5-one synthesis.

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Scheme 16: Catalytic aza-Wittig reactions in benzimidazole synthesis.

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Scheme 17: Phosphine-catalyzed Staudinger and aza-Wittig reactions.

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Scheme 18: Catalytic aza-Wittig reactions in 4(3H)-quinazolinone synthesis.

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Scheme 19: Catalytic aza-Wittig reactions of in situ generated carboxylic acid anhydrides.

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Scheme 20: Phosphine-catalyzed diaza-Wittig reactions.

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Album

Review

Published 30 Nov 2016

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Rasta resin–triphenylphosphine oxides and their use as recyclable heterogeneous reagent precursors in halogenation reactions

Xuanshu Xia and
Patrick H. Toy

Beilstein J. Org. Chem. 2014, 10, 1397–1405, doi:10.3762/bjoc.10.143

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Scheme 1: The Masaki–Fukui reaction and halophosphonium salt reduction.

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Scheme 2: Representative reactions involving halophosphonium salts 3a,b.

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Scheme 3: Catalytic Appel reactions reported by Denton and co-workers.

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Figure 1: Rasta resins 14 and 15.

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Scheme 4: Synthesis and applications of rasta resins 16 and 17a,b.

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Scheme 5: Synthesis of bifuncitonal rasta resin 18.

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Supp Info

Letter

Published 20 Jun 2014

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