Palladium-catalysed asymmetric synthesis of chiral sulfamidates and 2,5-dihydro-1H-pyrroles from underexplored building blocks

Overview

This research delivers two complementary palladium-catalysed synthetic methodologies that exploit underexplored building blocks—nitroenynes and sulfamidates—to access high-value chiral scaffolds. The first method enables the asymmetric Pd-catalysed allylation of prochiral sulfamidate heterocycles to produce allylated sulfamidate imines bearing a tetra-substituted chiral centre. Sulfamidates are direct precursors to amino-alcohols, structural motifs that are ubiquitous in bioactive molecules including pharmaceuticals and agrochemicals. The second method uses a Pd-catalysed (3+2) cycloaddition of 2-nitro-1,3-enynes to generate 2,5-dihydro-1H-pyrroles (2,5-DHPs) with an embedded dien-yne functionality, opening new avenues for downstream cycloaddition and functionalisation chemistry. Together, these methods expand the toolkit available to synthetic chemists working on drug discovery and complex molecule synthesis.

Technical specifications

Chiral sulfamidate synthesis:

• Asymmetric Pd-catalysed allylation of prochiral sulfamidate heterocycles
• Produces allylated sulfamidate imines featuring a tetra-substituted stereogenic centre
• Provides direct access to chiral amino-alcohol precursors relevant to bioactive molecule construction

2,5-Dihydro-1H-pyrrole synthesis:

• Pd-catalysed (3+2) cycloaddition of 2-nitro-1,3-enynes
• Generates 2,5-DHP scaffolds with an embedded dien-yne motif
• The dien-yne functionality offers handles for further downstream transformations and cycloaddition chemistry

Underlying catalytic platform:

• Both methods harness Pd-catalysed reactivity on underexplored building blocks, broadening the scope of accessible heterocyclic architectures

Technology readiness level

These methodologies are at an early research and proof-of-concept stage. The underlying hypotheses have been formulated around harnessing Pd-catalysed reactions of underutilised substrates, but the proposals do not specify completed experimental validation procedures or future validation milestones. Further experimental work is required to confirm scope, stereoselectivity, yields, and substrate generality before the methods can be progressed toward optimisation and broader application development.