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Halogen‐Imparted Reactivity in Lithium Carbenoid Mediated Homologations of Imine Surrogates: Direct Assembly of bis‐Trifluoromethyl‐β‐Diketiminates and the Dual Role of LiCH 2 I
Author(s) -
Ielo Laura,
Castoldi Laura,
Touqeer Saad,
Lombino Jessica,
Roller Alexander,
Prandi Cristina,
Holzer Wolfgang,
Pace Vittorio
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202007954
Subject(s) - carbenoid , metalation , imine , chemistry , trifluoromethyl , halogen , lithium (medication) , combinatorial chemistry , nucleophile , reactivity (psychology) , stereochemistry , catalysis , organic chemistry , psychology , rhodium , medicine , alkyl , alternative medicine , pathology , psychiatry
The selective formal insertion (homologation) of a carbon unit bridging the two trifluoroacetamidoyl chlorides (TFAICs) units is reported. The tactic is levered on a highly chemoselective homologation–metalation–acyl nucleophilic substitution sequence which precisely enables to assemble novel trifluoromethylated β‐diketiminates within a single synthetic operation. Unlike previous homologations conducted with LiCH 2 Cl furnishing aziridines, herein we exploit the unique capability of iodomethyllithium to act contemporaneously as a C1 source (homologating effect) and metalating agent. The mechanistic rationale grounded on experimental evidences supports the hypothesized proposal and, the structural analysis gathers key aspects of this class of valuable ligands in catalysis.