Activation of Isocyanates and Carbon Dioxide by a Monomeric Aluminium Hydrazide as an Active Lewis Pair
作者： Frank Hengesbach , Xing Jin , Alexander Hepp , Birgit Wibbeling , Ernst-Ulrich Würthwein
关键词: Chemistry 、 Organic synthesis 、 Organic chemistry 、 Hydrazide 、 Medicinal chemistry 、 Adduct 、 Moiety 、 Aluminium 、 Derivative (chemistry) 、 Piperidine 、 Monomer
摘要: The monomeric aluminium hydrazide H10C5NNAtBu2)� Ad (4; = adamantyl, NC5H10 piperidinyl) was obtained in high yield by hydroalu- mination of the corresponding hydra- zone derivative 1. Compound 4 has a strained AlN2 heterocycle formed donor-acceptor bond between b-ni- trogen atom group and atom. Opening this resulted formation an active Lewis pair that able to cooperatively activate carbon dioxide or isocyanates. Insertion hetero- cumulenes into AlN selec- tively afforded carbamate two urea derivatives yield. In first step, phenyl isocyanate gave adduct 6, which oxygen coordinated its central bound nitrogen piperidine moiety. Adduct 6 represents reason- A intermediate state for these activa- tion processes. applicability hy- droaluminated compounds, such as 4, organic synthesis demonstrated reaction with imidoyl chlor- ide, ami- drazone 9.
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