Asymmetric Synthesis of Spirobenzazepinones with Atroposelectivity and Spiro-1,2-Diazepinones by NHC-Catalyzed [3+4] Annulation Reactions

A strategy for the NHC‐catalyzed asymmetric synthesis of spirobenzazepinones, spiro‐1,2‐diazepinones, and spiro‐1,2‐oxazepinones has been developed via [3+4]‐cycloaddition reactions of isatin‐derived enals (3C component) with in‐situ‐generated aza‐o‐quinone methides, azoalkenes, and nitrosoalkenes (...

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Veröffentlicht in:Angewandte Chemie 2016-09, Vol.128 (37), p.11276-11280
Hauptverfasser: Wang, Lei, Li, Sun, Blümel, Marcus, Philipps, Arne R., Wang, Ai, Puttreddy, Rakesh, Rissanen, Kari, Enders, Dieter
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container_end_page 11280
container_issue 37
container_start_page 11276
container_title Angewandte Chemie
container_volume 128
creator Wang, Lei
Li, Sun
Blümel, Marcus
Philipps, Arne R.
Wang, Ai
Puttreddy, Rakesh
Rissanen, Kari
Enders, Dieter
description A strategy for the NHC‐catalyzed asymmetric synthesis of spirobenzazepinones, spiro‐1,2‐diazepinones, and spiro‐1,2‐oxazepinones has been developed via [3+4]‐cycloaddition reactions of isatin‐derived enals (3C component) with in‐situ‐generated aza‐o‐quinone methides, azoalkenes, and nitrosoalkenes (4atom components). The [3+4] annulation strategy leads to the seven‐membered target spiro heterocycles bearing an oxindole moiety in high yields and excellent enantioselectivities with a wide variety of substrates. Notably, the benzazepinone synthesis is atroposelective and an all‐carbon spiro stereocenter is generated. Spiro über [3+4]: Die asymmetrische NHC‐katalysierte [3+4]‐Anellierung von Isatin‐abgeleiteten Enalen mit Arylsulfonamiden oder Tosylhydrazonen führt zu Spirobenzazepinonen mit Atropselektivität oder zu Spiro‐1,2‐diazepinonen mit Oxindol‐Einheit. Die Reaktionen laufen mit vielfältigen Substraten, hohen Ausbeuten und exzellenten Enantioselektivitäten ab.
doi_str_mv 10.1002/ange.201604819
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Chem</addtitle><description>A strategy for the NHC‐catalyzed asymmetric synthesis of spirobenzazepinones, spiro‐1,2‐diazepinones, and spiro‐1,2‐oxazepinones has been developed via [3+4]‐cycloaddition reactions of isatin‐derived enals (3C component) with in‐situ‐generated aza‐o‐quinone methides, azoalkenes, and nitrosoalkenes (4atom components). The [3+4] annulation strategy leads to the seven‐membered target spiro heterocycles bearing an oxindole moiety in high yields and excellent enantioselectivities with a wide variety of substrates. Notably, the benzazepinone synthesis is atroposelective and an all‐carbon spiro stereocenter is generated. Spiro über [3+4]: Die asymmetrische NHC‐katalysierte [3+4]‐Anellierung von Isatin‐abgeleiteten Enalen mit Arylsulfonamiden oder Tosylhydrazonen führt zu Spirobenzazepinonen mit Atropselektivität oder zu Spiro‐1,2‐diazepinonen mit Oxindol‐Einheit. 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subjects 1,2-Diazepinon
2-Diazepinon
Asymmetrische Synthesen
Asymmetry
Bearing
Benzazepinon
Chemical reactions
Chemistry
N-heterocyclische Carbene
Organic chemistry
Spiroverbindungen
Strategy
Substrates
Synthesis
Synthesis (chemistry)
title Asymmetric Synthesis of Spirobenzazepinones with Atroposelectivity and Spiro-1,2-Diazepinones by NHC-Catalyzed [3+4] Annulation Reactions
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