Studies on the synthesis of α-iodoaziridines and improved conditions for the synthesis of alkyl-α-iodoaziridines using ClMgCHI2
作者:Tom Boultwood、Dominic P. Affron、James A. Bull
DOI:10.1016/j.tet.2015.05.098
日期:2015.7
The effects of varying the N-group and using different carbenoids are investigated. Excellent cis-stereochemistry is achieved, except for N-carbamates containing aryl groups. Using the mixed carbenoid LiCHICl, the iodide leaving group is selected for cyclisation affording chloroaziridines only, as a cis/trans mixture. More convenient and higher yielding conditions for the preparation of alkyl N-Ts α-iodoaziridines
α-碘氮丙啶是完整的氮丙啶进一步功能化的不寻常的基序和有趣的结构。通过LiCHI 2与亚胺的加成环化反应可实现N保护的α-碘氮丙啶的制备。研究了改变N-基团和使用不同类胡萝卜素的影响。除了含有芳基的N-氨基甲酸酯以外,还可以实现优异的顺式立体化学。使用混合的类胡萝卜素LiCHICl,选择碘化物离去基团进行环化,仅提供氯氮丙啶,为顺式/反式混合物。制备烷基氮更方便,收率更高-Ts使用ClMgCHI 2开发了α-碘氮丙啶。另外,实现了有问题的伯烷基α-碘氮丙啶的形成。