Pd-Catalyzed Site-Selectivep-Hydroxyphenyloxylation of Benzylic α-C(sp3)–H Bonds with 1,4-Benzoquinone
摘要:
A Pd-catalyzed, site-selective p-hydroxypheny-loxylation of benzylic alpha-C(sp(3))-H bonds with 1,4-benzoquinone using thioamide as a directing group is reported. 1,4-Benzoquinone is employed as the p-hydroxyphenyloxy source without extra oxidants. This method exclusively gives site selectivity at alpha-C(sp(3))-H bonds rather than the usual beta-C(sp(3))-H bonds through C-H activation mode. The reactions proceed with high functional group tolerance in yields of 42-93%.
Chemoselective formal β-functionalization of substituted aliphatic amides enabled by a facile stereoselective oxidation event
作者:Adriano Bauer、Nuno Maulide
DOI:10.1039/c9sc03715b
日期:——
Aliphatic C-H functionalization is a topic of current intense interest in organic synthesis. Herein, we report that a facile and stereoselective dehydrogenation event enables the functionalization of aliphaticamides at different positions in a one-pot fashion. Derivatives of relevant pharmaceuticals were formally functionalized in the β-position in late-stage manner. A single-step synthesis of incrustoporine