A palladium-catalyzed intermolecular polarity-mismatched addition of unactivated alkyl radicals to unactivated alkenes was developed for the first time. In the two-component dicarbofunctionalization, a variety of primary, secondary, and tertiary unactivated alkyl halides regioselectively reacted with various unactivated olefins. A series of structurally complex heteropolycycles decorated with a quaternary
Combining photochemistry and catalysis: rapid access to sp<sup>3</sup> – rich polyheterocycles from simple pyrroles
作者:Emma E. Blackham、Jonathan P. Knowles、Jonathan Burgess、Kevin I. Booker-Milburn
DOI:10.1039/c5sc04062k
日期:——
The powerful combination of photochemistry and catalysis transforms simple pyrroles into complex polycyclic structures in just two steps. Initial formation of highly reactive aziridines enables new Pd-catalysed cascade sequences, forming a range of polyheterocycles including tricyclic [small beta]-lactams.
Complexity from Simplicity: Tricyclic Aziridines from the Rearrangement of Pyrroles by Batch and Flow Photochemistry
作者:Katie G. Maskill、Jonathan P. Knowles、Luke D. Elliott、Roger W. Alder、Kevin I. Booker-Milburn
DOI:10.1002/anie.201208892
日期:2013.1.28
Molecular acrobatics: Irradiation of N‐butenyl‐substituted pyrroles that bear an electron‐withdrawing group leads to complex tricyclicaziridines through an unprecedented photocycloaddition–rearrangement sequence. Gram quantities of these complex products could be produced by using a bespoke flow reactor (see picture, FEP=fluorinated ethylene propylene).
tetrahydroxydiboron and nickel chloride cocatalyzed radical cyclization cascade with a broad substrate scope and an ultrashort reaction time was developed. The mechanistic investigation indicated that the reaction might involve a homocleavage of tetrahydroxydiboron and nickel hydride intermediates. This approach enables the simple and efficient synthesis of a series of heteropolycycles.
Real-Time Biological Annotation of Synthetic Compounds
作者:Christopher J. Gerry、Bruce K. Hua、Mathias J. Wawer、Jonathan P. Knowles、Shawn D. Nelson Jr.、Oscar Verho、Sivaraman Dandapani、Bridget K. Wagner、Paul A. Clemons、Kevin I. Booker-Milburn、Zarko V. Boskovic、Stuart L. Schreiber
DOI:10.1021/jacs.6b04614
日期:2016.7.20
experiment, to annotate rapidly and inexpensively the biological activities of newly synthesized compounds. This readilyaccessible and inexpensive “real-time” profiling method can be used in a prospective manner to facilitate, for example, the efficient construction of performance-diverse small-molecule libraries that are enriched in bioactives. Here, we demonstrate this concept by synthesizing ten triads