Be dazzled by the sequence: The first efficient and general one‐pot method for the reductive bisalkylation of lactams/amides with Grignard and organolithium reagents has been developed (see scheme; DTBMP=2,6‐di‐tert‐butyl‐4‐methylpyridine, Tf=trifluoromethanesulfonyl).
General One-Pot Reductive<i>gem</i>-Bis-Alkylation of Tertiary Lactams/Amides: Rapid Construction of 1-Azaspirocycles and Formal Total Synthesis of (±)-Cephalotaxine
the first generalmethod for the direct transformation of tertiary lactams/amides into tert‐alkylamines. The method is based on in situ activation of amide with triflic anhydride/2,6‐di‐tert‐butyl‐4‐methylpyridine (DTBMP), followed by successive addition of two organometallic reagents of the same or different kinds to form two CC bonds. Both alkyl and functionalized organometallic reagents and enolates
Tf<sub>2</sub>O/TTBP (2,4,6-Tri-<i>tert</i>-butylpyrimidine): An Alternative Amide Activation System for the Direct Transformations of Both Tertiary and Secondary Amides
were generally obtained. In addition, Tf2O/TTBP combination was used to promote the condensation reactions of 2-(tert-butyldimethylsilyloxy)furan (TBSOF) with both tertiary and secondary amides, the one-pot reductive Bischler–Napieralski-type reaction of tertiary lactams, and Movassaghi and Hill’s modern version of the Bischler–Napieralskireaction. The value of the Tf2O/TTBP-based methodology was further
A practical method for the synthesis of gem-2,2-disubstituted tertiary amines from the corresponding lactams (or amides) is reported. It is based on the reaction of thioiminium ions, easily prepared from lactams and amides with organometallic reagents such allylmagnesium, benzylmagnesium, and primary alkylcerium reagents.