Chiral cycloalkylidene α,β-unsaturated iminium approach to stereoselective formal [3+3] cycloaddition reaction in spiroheterocycle synthesis
作者:Michael J McLaughlin、Hong C Shen、Richard P Hsung
DOI:10.1016/s0040-4039(00)02018-9
日期:2001.1
An approach to stereoselective formal [3+3] cycloaddition reaction using chiral cycloalkylidene α,β-unsaturated iminiums is described here leading to preparations of spiroheterocycles in modest stereoselectivity. The reversibility of 6π-electron electrocyclic ring closure did not always lead to the thermodynamically more favored product. These observations led to other useful mechanistic understanding
本文描述了一种使用手性环亚烷基α,β-不饱和亚胺的立体选择性形式[3 + 3]环加成反应的方法,该方法可制备中等立体选择性的螺杂环。6π-电子环闭环的可逆性并不总是导致热力学上更受青睐的产品。这些观察结果导致对1-氧杂环丁烷的电环闭合的其他有用的机理理解。