Sultines as o-Quinodimethane Precursors in an Oxa-Diels–Alder Reaction: Synthesis of Functionalized Isochromans
作者:Aurapat Ngamnithiporn、Padon Chuentragool、Poramate Songthammawat、Supakarn Punnita、Kittithuch Photong、Poonsakdi Ploypradith、Somsak Ruchirawat
DOI:10.1055/a-2236-9589
日期:——
The development of an oxa-Diels–Alder reaction between sultines and carbonyl compounds is reported. o-Quinodimethanes, generated from sultines, undergo a [4+2]-cycloaddition with activated aldehydes or ketones in the presence of Cu(OTf)2 to provide a variety of functionalized isochromans, including spiroisochromans, in up to 99% yield. The developed protocol demonstrates broad functional-group compatibility
据报道,磺胺类化合物和羰基化合物之间发生了 oxa-Diels-Alder 反应。由磺基磺胺产生的邻喹啉二甲烷在 Cu(OTf) 2存在下与活化的醛或酮进行 [4+2]-环加成,以提供各种官能化的异色满,包括螺异色满,产率高达 99%。所开发的方案表现出广泛的官能团兼容性,并耐受带有游离 NH 官能团的未受保护的靛红。