Expeditious Synthesis of 3,4-Dihydroisocoumarins and Phthalides Using the Heck-Matsuda Reaction. -Reaction of diazonium salt (I) with electron-rich styrenes gives isocoumarins,whereas electron deficient-olefins provide phthalides. A one-pot procedure is developed for the preparation of the unsaturated analogue (IV). In the case of substrate (VII), extension of the reaction time allows complete deprotection to produce the phenolic product (VIII). -(DA PENHA, E. T.; FORNI, J. A.; BIAGOLI, A. F. P.; CORREIA*, C. R. D.; Tetrahedron Lett. 52 (2011) 48, 6342-6345, http://dx.
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