Photoswitchable Oxidopyrylium Ylide for Photoclick Reaction with High Spatiotemporal Precision: A Dynamic Switching Strategy to Compensate for Molecular Diffusion
3-diaryl indenone epoxide (DIO) and mesoionic oxidopyryliumylide (PY) is governed by dual-λ gating, in which PY can undergo fast [5+2] cycloaddition with BCN. A photoswitchablestrategy for photoclick labeling with spatiotemporal control was developed, recycling the unreacted PY to minimize side-effects. Also, moleculardiffusion of the reactive PY was compensated for by improvement of the spatial accuracy