A Brief and Convergent Synthetic Route to Defucogilvocarcin M Chromophore: The Formal Synthesis of WS-5995 A and C
作者:Asit Patra、Pallab Pahari、Sutapa Ray、Dipakranjan Mal
DOI:10.1021/jo0512960
日期:2005.10.1
Densely substituted styryl sulfone 20 is shown to undergo double annulation with phthalide 21 to give, in one-pot operation and in excellent yield, the benzonaphthopyranone scaffold 22 of gilvocarcins.
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。
Kinetic Control of Rh(III)-Catalyzed Annulation of C–H Bonds with Quinones: Chemoselective Synthesis of Hydrophenanthridinones and Phenanthridinones
A temperature-dependent redox-neutral Rh(III)-catalyzed C-H bond annulation of N-methoxybenzamides with quinones was developed for the chemoselective synthesis of hydrophenanthridinones and phenanthridinones. This reaction involves an Rh(III)-catalyzed C-H bond functionalization and a subsequent cyclization through the directing group nucleophilic addition to the carbonyl group at room temperature.