We report a modular synthetic {strategy|technique|method|approach|tactic} for accessing heteroatom-containing polycyclic aromatic hydrocarbons (PAHs) that relies {on the|around the} controlled generation of transient heterocyclic alkynes and arynes. The strained intermediates undergo in situ trapping with readily accessible oxadiazinones. {Four|4} sequential pericyclic reactions {occur|happen|take place}, namely two Diels–Alder / retro-Diels–Alder sequences, which {can be|may be|could be|might be|is often|is usually} performed {in a|inside a|within a} stepwise or one-pot {fashion|style} to assemble {four|4} new carbon–carbon (C–C) bonds. Buy3-Chloro-5H-pyrrolo[2,3-b]pyrazine 3-Hydroxy-2-methyl-Butanoic acid uses PMID:23664186
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