摘要:
Epoxidation of (E)-(2S)-pentylidene(2-methylcyclopropane) 1 by MCPBA gave a 70:30 mixture of diastereomeric oxaspiropentanes 2 and 3, which underwent lithium iodide induced ring expansion and Baeyer Villiger oxidation to produce the Quercus lactone a (>92% eel. (C) 1997 Elsevier Science Ltd.