High Performance of <i>N</i>-Alkoxycarbonyl-imines in Triethylborane-Mediated Tin-Free Radical Addition
作者:Ken-ichi Yamada、Takehito Konishi、Mayu Nakano、Shintaro Fujii、Romain Cadou、Yasutomo Yamamoto、Kiyoshi Tomioka
DOI:10.1021/jo2025042
日期:2012.2.3
Triethylborane-mediated tin-free radical alkylation of N-alkoxycarbonyl-imines, such as N-Boc-, N-Cbz-, and N-Teoc-imines, proceeded smoothly at a low temperature (−78 to −20 °C) to give the corresponding adducts in high yield. Although the formation of isocyanate was the major unfavorable reaction at room temperature, a one-pot conversion of N-Boc-imine to N-ethoxycarbonyl-adduct was possible through
三乙基硼烷介导的N-烷氧基羰基-亚胺(例如N- Boc-,N- Cbz-和N- Teoc-亚胺)的锡自由基烷基化在低温(-78至-20°C)至以高收率得到相应的加合物。尽管异氰酸酯的形成在室温下是主要的不利反应的一锅转化N-将Boc-亚胺ñ -乙氧羰基的加合物通过在原位产生的相应的异氰酸酯是可能的。N-烷氧基羰基-亚胺比N- Ts-和N具有更高的性能-PMP-亚胺通过烷氧基羰基的适度吸电子特征而合理化,该特征使烷基的添加和由三乙基硼烷有效地捕获所形成的氨基自由基都快速地进行。