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
Polarity-Reversed Allylations of Aldehydes, Ketones, and Imines Enabled by Hantzsch Ester in Photoredox Catalysis
作者:Li Qi、Yiyun Chen
DOI:10.1002/anie.201607813
日期:2016.10.10
polarity reversal (umpolung) reaction is an invaluable tool for reversing the chemical reactivity of carbonyl and iminyl groups, which subsequent cross‐couplingreactions to form C−C bonds offers a unique perspective in synthetic planning and implementation. Reported herein is the first visible‐light‐induced polarity‐reversed allylation and intermolecular Michael addition reaction of aldehydes, ketones
TITANIUM COMPOUNDS AND PROCESS FOR CYANATION OF IMINES
申请人:Seayad Abdul Majeed
公开号:US20110319629A1
公开(公告)日:2011-12-29
The present invention relates to titanium catalysts for synthesis reactions produced by bringing a reaction mixture comprising a titanium alkoxide and a ligand in contact with water, wherein the ligand is represented by the general formula (e): wherein R
1
, R
2
, R
3
, and R
4
are independently a hydrogen atom, an alkyl group, or the like, and (A) represents a group with two or more carbon atoms. The titanium catalysts may be isolated in solid form and may be stored. The invention further relates to a process for cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
Copper-Catalyzed Cross-Coupling of Imines, Acid Chlorides, and Organostannanes: A Multicomponent Synthesis of α-Substituted Amides
作者:Daniel A. Black、Bruce A. Arndtsen
DOI:10.1021/jo0503557
日期:2005.6.1
A copper-catalyzedcross-coupling of organotin reagents with imines and acid chlorides is reported. The reaction proceeds efficiently with a range of vinyl-, alkyl-, aryl- and heteroaryl-substituted organostannanes as well as a diverse set of imines of non-enolizable aldehydes. Use of chloroformates also allows for the formation of N-protected α-substituted amines. This chemistry has been applied to
Direct, Palladium-Catalyzed, Multicomponent Synthesis of β-Lactams from Imines, Acid Chloride, and Carbon Monoxide
作者:Rajiv Dhawan、Rania D. Dghaym、Daniel J. St. Cyr、Bruce A. Arndtsen
DOI:10.1021/ol061308j
日期:2006.8.1
A new palladium-catalyzed synthesis of 3-amido-substituted beta-lactams is reported. This process involves the one-pot coupling of four components, imines, carbonmonoxide, and acidchloride, providing a flexible route to construct this class of heterocycle. The generation of beta-lactams with two different imines can also be accomplished, providing a method to assemble these products with independent