Sequential and cascade [2+2] — cycloaddition-palladium catalysed cyclisation: Bicyclic β-lactams
摘要:
Sequential and cascade ketene-imine [2+2]-cycloaddition-palladium catalysed cyclisation reactions occur in good yield. Racemic and homochiral examples incorporating a range of aromatic and heteroaromatic rings are reported.
Cycloaddition Reactions of Imines with 3-Thiosuccinic Anhydrides: Synthesis of the Tricyclic Core of Martinellic Acid
摘要:
Arylthio-substituted succinic anhydrides undergo cycloaddition reactions with imines to produce gamma-lactams in high yield and with high diastereoselectivity. The origin of the selectivity is proposed to result from anion-pi repulsion in the transition state. The utility of this technique is demonstrated in a synthesis of the carbon framework common to the alkaloids martinellic acid and martinelline in five steps.
Palladium-Catalyzed, Multicomponent Approach to β-Lactams via Aryl Halide Carbonylation
作者:Gerardo M. Torres、Maximiliano De La Higuera Macias、Jeffrey S. Quesnel、Oliver P. Williams、Veeranna Yempally、Ashfaq A. Bengali、Bruce A. Arndtsen
DOI:10.1021/acs.joc.6b02405
日期:2016.12.16
A palladium-catalyzed multicomponent method for the synthesis of β-lactams from imines, aryl halides, and CO has been developed. This transformation proceeds viatwo tandem catalytic carbonylation reactions mediated by Pd(PtBu3)2 and provides a route to prepare these products from five separate reagents. A diverse range of polysubstituted β-lactams can be generated by systematic variation of the substrates
已经开发了一种由亚胺,卤代芳基和一氧化碳合成β-内酰胺的钯催化多组分方法。该转化通过由Pd(P t Bu 3)2介导的两个串联催化羰基化反应进行,并提供了从五种单独的试剂制备这些产物的途径。通过底物的系统变化可以产生各种各样的多取代的β-内酰胺。该方法还可以扩展为使用碘取代的亚胺以高产率和选择性生产新型螺环β-内酰胺。
Suzuki H., Abe H., Thiruvikraman S. V., J. Org. Chem, 59 (1994) N 20, S 6116-6118