An interesting sequential three-component reaction provides a facile synthesis of selenium/sulfur-substituted 3-oxabicyclo[4.2.0]octa-1(8),5-diene and tetrahydro-1H-isochromene from lithium alkylselenolates or alkylthiolates, 1-alkynylphosphine oxides, and aldehydes. The sequential reaction proceeds via a conjugate addition/condensation/elimination process to form the allene intermediate, which subsequently underwent [2 + 2] or [4 + 2] cyclization reaction to afford bicyclic frameworks.
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