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- W2069766863 abstract "Die Reaktion des Ketens 1 mit dem Thiazin 2b und den 2-Phenyl-substituierten Heterocyclen 2c oder d führt zu [1:1]-Cycloaddukten 4 mit dem Penam- bzw. Cepham-Gerüst. Die Produkte liegen stereochemisch einheitlich in der Konfiguration 4A vor. Aus der Umsetzung mit den Thiazolinen 2a und 7 werden keine β-Lactame, sondern in Abhängigkeit von den Reaktionsbedingungen die [2:1]-Cycloaddukte 5, 8 und die [1:2]-Cycloaddukte 6, 9 isoliert. Cycloaddition Reactions of Heterocumulenes, XVIII. — Reactions of tert-Butylcyanoketene with Cyclic Thioimidates The reactions of the ketene 1 with the thiazine 2b and the 2-phenyl substituted heterocycles 2c or d lead to the [1:1]-cycloadducts 4 with the penam or cepham framework, respectively. All the products have the same configuration 4A. The reaction with the thiazolines 2a and 7 gives no β-lactams but, instead, the [2:1]-cycloadducts 5, 8 and the [1:2]-cycloadducts 6, 9 in yields depending upon the reaction conditions." @default.
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- W2069766863 date "1979-03-26" @default.
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- W2069766863 title "Cycloadditionsreaktionen von Heterokumulenen, XVIII Umsetzung destert-Butylcyanketens mit cyclischen Thioimidsäureestern" @default.
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- W2069766863 doi "https://doi.org/10.1002/jlac.197919790306" @default.
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