aromatic aldehydes and silyl enol ethers in benzene as the solvent. The reactions occur with high simple diastereoselectivity and, when R¹ is chiral, with high facial diastereoselectivity. Under similar conditions, but in acetonitrile rather than benzene as the preferred solvent, the Paternò-Büchi reaction of N-acylenamines (enamides) gives the corresponding protected 3-aminooxetanes. The cis-products
Hydroxyl-directed reductive ring opening at the C-2 position of functionalized 2-aryloxetanes
作者:Thorsten Bach、Christian Lange
DOI:10.1016/0040-4039(96)00781-2
日期:1996.6
2-Aryloxetanes 3 are cleaved at the C-2position upon treatment with lithium aluminium hydride to deliver the triols 4 in good yields (61–85 %). The regioselective ringopening at the more hindered position is facilitated by a hydoxyl group attached to the arene.