Catalytic Alkene Difunctionalization via Imidate Radicals
作者:Kohki M. Nakafuku、Stacy C. Fosu、David A. Nagib
DOI:10.1021/jacs.8b07578
日期:2018.9.12
The first catalytic strategy to harness imidate radicals has been developed. This approach enables alkene difunctionalization of allyl alcohols by photocatalytic reduction of their oxime imidates. The ensuing imidate radicals undergo consecutive intra- and intermolecular reactions to afford (i) hydroamination, (ii) aminoalkylation, or (iii) aminoarylation, via three distinct radical mechanisms. The
第一个利用酰亚胺自由基的催化策略已经开发出来。这种方法可以通过光催化还原烯丙醇的肟酰亚胺酯来实现烯丙醇的烯烃双官能化。随后的亚氨酸酯自由基经历连续的分子内和分子间反应,通过三种不同的自由基机制提供(i)氢胺化、(ii)氨基烷基化或(iii)氨基芳基化。介绍了这种亚胺酯自由基反应催化方法的广泛范围和实用性,以及与其他 N 中心自由基和互补的闭壳亚胺酯途径的比较。
Highly selective γ-alkylation of triisopropylsilylallyl anion. Synthesis of α-triisopropylsilyl aldehydes.
作者:Joseph M. Muchowski、Reto Naef、Michael L. Maddox
DOI:10.1016/s0040-4039(00)98211-x
日期:1985.1
The reaction of triisopropylsilylallyllithium with alkyl halides took place with considerably greater γ-selectivity than reported for trimethylsilyl allyllithium. Silica gel induced rearrangement of the epoxides 5 derived from the alkylation products 3 gave α-triisopropylsilyl aldehydes 6 by a process in which silyl group transposition occurred with predominant inversion at the migration terminus.