A one-pot three-component reaction for the preparation of highly functionalized tryptamines
摘要:
We have developed a general one-pot method to provide highly functionalized tryptamine derivatives, via a Fischer indole type pathway. In this article, we demonstrate optimal conditions for a one-pot indole synthesis, allowing for the synthesis of a broad scope of 2-methyl tryptamine derivatives and a precursor for the synthesis of the core structure of some akuammiline alkaloids. Additionally, further modification of the indole products is described. Published by Elsevier Ltd.
Synthesis of Azepine Derivatives by Silver-Catalyzed [5+2] Cycloaddition of<i>γ</i>-Amino Ketones with Alkynes
作者:Ming-Bo Zhou、Ren-Jie Song、Cheng-Yong Wang、Jin-Heng Li
DOI:10.1002/anie.201304902
日期:2013.10.4
Silver forges the ring: A new and practical silver‐catalyzed [5+2] cycloaddition method has been developed for the synthesis of azepines through the formation of four new chemical bonds between a γ‐amino ketone and an alkyne in one step. This method provides a new hetero‐[5+2] cycloaddition strategy for the construction of seven‐membered ring systems.
Reversible Alkene Insertion into the Pd–N Bond of Pd(II)-Sulfonamidates and Implications for Catalytic Amidation Reactions
作者:Paul B. White、Shannon S. Stahl
DOI:10.1021/ja208560h
日期:2011.11.23
Alkeneinsertion into Pd-N bonds is a key step in Pd-catalyzed oxidative amidation of alkenes. A series of well-defined Pd(II)-sulfonamidate complexes have been prepared and shown to react via insertion of a tethered alkene. The Pd-amidate and resulting Pd-alkyl species have been crystallographically characterized. The alkeneinsertion reaction is found to be reversible, but complete conversion to
Carbene Reactions of α-Oxacyclo- and α-Azacyclo-N-aziridinylimines: Effect of Heteroatom and Ring Size in the Ring Expansion Reaction
作者:Sunggak Kim、Joo-Yong Yoon
DOI:10.1055/s-2000-7598
日期:——
Carbenes, generated from thermolysis of α-oxacyclo- and α-azacyclo-N-aziridinylimines in refluxing toluene, underwent ring expansions via insertion of alkyl carbenes into carbon-carbon bonds and intramolecular ammonium ylide formations, respectively. Ring expansion reaction of α-oxetanyl-N-aziridinylimines occurred via alkylidenecarbene intermediates, whereas thermal reaction of α-azetidinyl-N-aziridinylimines afforded α-aminoacetylene compounds via 1,2-H migration of alkylidenecarbene intermediates.