Synthesis and reactivity of optically active spiroketals by ring-expansion of chromium carbene complex-derived cyclobutanones

被引:28
作者
Bueno, AB [1 ]
Hegedus, LS [1 ]
机构
[1] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA
关键词
D O I
10.1021/jo971665v
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Photolysis of cyclic chromium alkoxycarbene complexes with an optically active ene-carbamate gave spirofused, optically active cyclobutanones. Baeyer-Villiger ring expansion followed by further functionalization gave optically active spiroketals. Photochemical ring expansion of these spirofused cyclobutanones in the presence of acetic acid or thiophenol gave 2-acetoxy- or 2-(thiophenoxy)-4-spirofused tetrahydrofurans. Elimination of the thiophenoxy group gave a 3,4-dihydrofuran that underwent Heck arylation and photochemical cycloaddition with chromium carbene complexes to give cyclobutanones.
引用
收藏
页码:684 / 690
页数:7
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