Iron-Catalyzed Reductive Ethylation of Imines with Ethanol
作者:Marie Vayer、Sara P. Morcillo、Jennifer Dupont、Vincent Gandon、Christophe Bour
DOI:10.1002/anie.201800328
日期:2018.3.12
complex as precatalyst. This approach opens new perspectives in this area as it enables the synthesis of unsymmetric tertiary amines from readily available substrates and ethanol as a C2 building block. A variety of imines bearing electron‐rich aryl or alkyl groups at the nitrogen atom could be efficiently reductively alkylated without the need for molecular hydrogen. The mechanism of this reaction, which
Direct Synthesis of Pyrroles from Imines, Alkynes, and Acid Chlorides: An Isocyanide-Mediated Reaction
作者:Daniel J. St. Cyr、Nicolas Martin、Bruce A. Arndtsen
DOI:10.1021/ol062773j
日期:2007.2.1
[reaction: see text] A direct synthesis of pyrroles from imines, acid chlorides, and alkynes mediated by isocyanides is reported. This reaction proceeds with a range of each of these three substrates, providing a method to generate families of pyrroles in high yield. Mechanistic studies suggest this process proceeds via the generation of imino analogues of munchnones, which can undergo in situ coupling
Palladium-Catalyzed CH Activation of N-Allyl Imines: Regioselective Allylic Alkylations to Deliver Substituted Aza-1,3-Dienes
作者:Barry M. Trost、Subham Mahapatra、Martin Hansen
DOI:10.1002/anie.201501322
日期:2015.5.11
mode of activation of an imine via a rare aza‐substituted π‐allyl complex is described. Palladium‐catalyzed C(sp3)H activation of the N‐allyl imine and the subsequent nucleophilic attack by the α‐alkyl cyanoester produced the 1‐aza‐1,3‐diene as the sole regioisomer. In contrast, nucleophilic attack by the α‐aryl cyanoester exclusively delivered the 2‐aza‐1,3‐diene, which was employed in an inverse‐electron‐demand
A very straightforward route to 1-azabicyclo alkaloid scaffolds with several ring sizes is reported. The final bicyclic structures were built through a synthetic scheme that involved (i) the construction of dienic 4-piperidone systems by an imino-Diels−Alder reaction between aminotrienes and N-ω-vinylimines, in the presence of Yb(OTf)3, and (ii) the ring-closing metathesis reaction of these cyclic