4.6 Review

Synthesis of 1,3-disubstituted bicyclo[1.1.1]pentanes by cross-coupling induced by transition metals - formation of C-C bonds

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Summary: Replacing aryl rings with saturated carbocyclic structures is of great interest in drug discovery for improved pharmacokinetic properties. However, the synthesis of 2-substituted BCPs remains challenging and nonmodular. This study presents a generalizable strategy for bridge functionalization and demonstrates a streamlined pathway to diverse 2-substituted BCPs through radical C-H abstraction and metallaphotoredox protocols.

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Summary: Bicyclo[1.1.1]pentanes (BCPs) have emerged as attractive bioisosteres for para-substituted benzene rings in drug design. They offer various advantages compared to aromatic parents and can be synthesized using a wide array of methods. This perspective discusses the evolution of BCP synthesis methods, recent breakthroughs in bridge-substituted BCPs synthesis, and post-synthesis functionalization. The review also explores new challenges and directions in the field, including the emergence of other small ring hydrocarbons and heterocycles with unique substituent exit vectors.

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Summary: This study presents a novel approach for the synthesis of multisubstituted BCPs via intramolecular cyclization, enabling the construction of underexplored multisubstituted BCPs from readily accessible cyclobutanones. The method demonstrates broad generality through the synthesis of a variety of other caged bicyclic molecules, highlighting the ability to enable the programmed and divergent synthesis of multisubstituted bicyclic hydrocarbons.

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