Sonochemical cleavage of 2-(bromomethyl)aziridines by a zinc–copper couple
摘要:
1-Alkyl- and 1-arylmethyl-2-(bromomethyl)aziridines are readily cleaved by the sonochemical zinc-copper couple in aqueous methanol at room temp. to afford allylamines.
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
Enantioselective Organocatalysis of Strecker and Mannich Reactions Based on Carbohydrates
作者:Christian Becker、Christine Hoben、Horst Kunz
DOI:10.1002/adsc.200600370
日期:2007.2.5
Efficient organocatalysts for enantioselective Strecker and Mannichreactions were constructed from glucosamine as a readily accessible chiral scaffold. A variety of aromatic aldimines were subjected to hydrocyanation with good to excellent yield (72–98 %) and, in part, high enantioselectivity (69–95 % ee). Influence of the catalyst architecture on the enantioselectivity obviously arises from restrictions
A New Use of Wittig-Type Reagents as 1,3-Dipolar Cycloaddition Precursors and in Pyrrole Synthesis
作者:Daniel J. St. Cyr、Bruce A. Arndtsen
DOI:10.1021/ja074330w
日期:2007.10.1
generate a new class of phosphorus-based 1,3-dipolar cycloaddition reagent. These substrates, which are isomeric forms of classic Wittig reagents, undergo cycloaddition reactions in an analogous fashion to 1,3-oxazolium-5-oxides (Munchnones). However, these 1,3-dipoles can be generated in one pot, in a modular fashion, and directly from available reagents, suggesting their potential general utility in