?-Chlor-nitrone II: Eine Methode zur Darstellung von ?-Lactonen aus Olefinen. �ber synthetische Methoden, 6. (vorl�ufige) Mitteilung
作者:T. K. Das Gupta、Dorothee Felix、U. M. Kempe、A. Eschenmoser
DOI:10.1002/hlca.19720550641
日期:1972.7.10
The addition products obtained by the Ag+-induced reaction of α-chloro-aldonitrones with olefins (see preceding communication) can be utilized efficiently for making γ-lactones (see scheme 1).
Reactions of α-chloronitrones with unsaturated ethers
作者:Shlomo Levinger、Shimon Shatzmiller
DOI:10.1016/0040-4020(78)80053-2
日期:1978.1
The Ag+ induced reaction of α-chloronitrones with unsaturatedethers goes in two parallel competitive directions. On the one hand cycloadducts like 3 are formed and on the other hand oxonium ions like 4. Formation of analogous oxonium compounds occurs also when α-alkoxynitrones are treated with Et3O+BF4− in 1,2-dichloroethane. Formation of oxonium compounds with the enol-ethers is practically irreversible
Ag +诱导的α-氯硝酮与不饱和醚的反应在两个平行的竞争方向上进行。上形成一方面cycloadducts像3和在另一方面氧鎓离子如4.形成类似氧鎓化合物也发生在α-alkoxynitrones被用Et处理3 ö + BF 4 -的1,2-二氯乙烷。氧烯化合物与烯醇醚的形成实际上是不可逆的,并导致烯醇醚断裂。与饱和醚一起形成了类似于25的化合物,并将其用作N-烷基-N-乙烯基-亚硝鎓离子的潜在来源。
?-Chlor-nitrone I: Darstellung und Ag+-induzierte Reaktion mit Olefinen. �ber synthetische Methoden, 5. (vorl�ufige) Mitteilung
作者:U. M. Kempe、T. K. Das Gupta、K. Blatt、P. Gygax、Dorothee Felix、A. Eschenmoser
DOI:10.1002/hlca.19720550640
日期:1972.7.10
that would undergo cycloaddition reactions with any isolated olefinic doublebond, in contrast to most of the classical Diels-Alder or 1,3-dipolar addition reagents which, as a rule, require activated olefins in order to participate smoothly in cycloaddition processes. This paper introduces α-chloronitrones as precursors of a new class of such reagents; they undergo an Ag+-induced reaction with unactivated