描述了铑(III)催化的亚砜基吡啶的邻位C-H官能化,然后与醌进行分子内环化反应,其中亚砜基吡啶中的羰基用作螯合基团。该方案导致2-羟基-6 H-苯并[ c ]铬n-6-one衍生物的有效形成,并进行了亚砜基磺酸盐中C(O)-S键的裂解。该协议具有高化学选择性和官能团耐受性的特点,其中亚硫酸sulf盐作为芳酰基源。
Rh(<scp>iii</scp>)-catalyzed oxidative C–H bond arylation with hydroquinones: sustainable synthesis of dibenzo[b,d]pyran-6-ones and benzo[d]naphtho[1,2-b]pyran-6-ones
An efficient Rh(iii)-catalyzed C–H bond arylation with phenol derivatives was developed for the direct and sustainable synthesis of dibenzo[b,d]pyran-6-ones and benzo[d]naphtho[1,2-b]pyran-6-ones.
Rh(<scp>iii</scp>)-catalyzed synthesis of dibenzo[<i>b</i>,<i>d</i>]pyran-6-ones from aryl ketone <i>O</i>-acetyl oximes and quinones <i>via</i> C–H activation and C–C bond cleavage
作者:Wei Yang、Haonan Zhang、Yu Liu、Cuiman Tang、Xiaohui Xu、Jiaqi Liu
DOI:10.1039/d2ra02074b
日期:——
A redox-neutral synthesis of dibenzo[b,d]pyran-6-ones from aryl ketone O-acetyl oximes and quinones has been realized via Rh(III)-catalyzedcascade C–H activation annulation. A possible Rh(III)–Rh(V)–Rh(III) mechanism involving an unprecedented β-C elimination step was proposed.
通过Rh( III )催化级联C-H活化环化,实现了从芳基酮O-乙酰肟和醌氧化还原中性合成二苯并[ b , d ]吡喃-6-酮。提出了一种可能的 Rh( III )–Rh( V )–Rh( III ) 机制,涉及前所未有的 β-C 消除步骤。
Rh(<scp>iii</scp>)-Catalyzed sequential <i>ortho</i>-C–H oxidative arylation/cyclization of sulfoxonium ylides with quinones toward 2-hydroxy-dibenzo[<i>b,d</i>]pyran-6-ones
作者:Yaqun Dong、Jin-Tao Yu、Song Sun、Jiang Cheng
DOI:10.1039/d0cc00176g
日期:——
d ortho-C–H functionalization of sulfoxoniumylides followed by intramolecular annulation reactions with quinones was described, where the carbonyl in sulfoxoniumylides served as a chelation group. This protocol leads to the efficient formation of 2-hydroxy-6H-benzo[c]chromen-6-one derivatives, proceeding with the cleavage of the C(O)–S bond in sulfoxoniumylides. This protocol featured high chemo-selectivity
描述了铑(III)催化的亚砜基吡啶的邻位C-H官能化,然后与醌进行分子内环化反应,其中亚砜基吡啶中的羰基用作螯合基团。该方案导致2-羟基-6 H-苯并[ c ]铬n-6-one衍生物的有效形成,并进行了亚砜基磺酸盐中C(O)-S键的裂解。该协议具有高化学选择性和官能团耐受性的特点,其中亚硫酸sulf盐作为芳酰基源。