作者:Fernando R. P. Crisóstomo、Tomás Martín、Víctor S. Martín
DOI:10.1021/ol0363570
日期:2004.2.1
[reaction: see text] The intramolecular nucleophilic attack of the epoxides on the exo-Co(2)(CO)(6)-propargylic cations provided cyclic ethers in good yields. The use of substrates with stereochemically defined oxiranes provided polysubstituted tetrahydropyrans and oxepanes with a high degree of stereocontrol. The cyclization is sensitive to the nature of the protecting group used at the primary alcohol
[反应:见正文]环氧化物对exo-Co(2)(CO)(6)-炔丙基阳离子的分子内亲核攻击以高收率提供了环醚。具有立体化学定义的氧杂环戊烷的底物的使用提供了高度立体控制的多取代的四氢吡喃和氧杂环丁烷。环化对在伯醇上使用的保护基的性质敏感,就区域选择性和产率而言,碳酸叔丁酯的使用非常有效。