A cobalt‐catalyzed regioselective [4+2] annulation/lactonization reaction of benzamides with 4‐hydroxy‐2‐alkynoates is reported. This reaction utilizes air as an oxidant rather than metal salts. The method is operationally simple, mild, and sustainable. This protocol exhibits a broad substrate scope and compatible with a variety of functional groups furnishing the corresponding 1,4‐dihydrofuro[3,4‐c]isoquinoline‐3
据报道,苯甲酰胺与4-羟基-2-链烷酸酯发生钴催化的区域选择性[4 + 2]环化/内酯化反应。该反应利用空气而不是金属盐作为氧化剂。该方法操作简单,温和且可持续。该方案具有广泛的底物范围,并与提供相应的1,4-二氢呋喃[3,4- c ]异喹啉-3,5-二酮衍生物的各种官能团兼容,具有良好的产率和较高的区域选择性。
Gold-Catalyzed One-Step Practical Synthesis of Oxetan-3-ones from Readily Available Propargylic Alcohols
作者:Longwu Ye、Weimin He、Liming Zhang
DOI:10.1021/ja1033952
日期:2010.6.30
A general solution for the synthesis of various oxetan-3-ones is developed. This reaction uses readily available propargylic alcohols as substrates and proceeds without the exclusion of moisture or air ("open flask"). Notably, oxetan-3-one, a highly valuable substrate for drug discovery, can be prepared in one step from propargyl alcohol in a fairly good yield. The facile formation of the strained
Manganese‐Catalysed C−H Activation: A Regioselective C−H Alkenylation of Indoles and other (hetero)aromatics with 4‐Hydroxy‐2‐Alkynoates Leading to Concomitant Lactonization
A manganese‐catalyzed C−H bond alkenylation of indoles at C2‐position with 4‐hydroxy‐2‐alkynoatesleading to concomitantlactonization under removable directing group strategy has been disclosed. This lactonization strategy exhibits regioselectivity, a broad substrate scope, and a good functional group tolerance furnishing the products in low to high yields. The regioselectivity is guided by the electronic
Synthesis of Furanone-Fused 1,2-Benzothiazine by Rh(III)-Catalyzed C–H Activation: Regioselective Oxidative Annulation Leading to in Situ Lactonization in One Pot
sulfoximine-directed C–Hactivation strategy catalyzed by a Rh(III)-catalyst leads to an efficient synthesis of furanone-fused 1,2-benzothiazine. In this reaction, cascade C–Hactivation, regioselective annulation, and lactonization occur in one pot. 4-Hydroxy-2-alkynoates, as coupling partners, form unsymmetrical alkynes, which undergo lactonization after C–Hactivation and regioselective annulation. The
Rhodium(III)-Catalyzed C–H Activation: A Cascade Approach for the Regioselective Synthesis of Fused Heterocyclic Lactone Scaffolds
作者:Anil Kumar、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.joc.9b03266
日期:2020.3.6
A Rh(III)-catalyzed cascade C-H activation; regioselective [4 + 2] oxidative annulation; and lactonization of aromatic acids, anhydrides, and acrylic acid derivatives with 4-hydroxy-2-alkynoates have been disclosed. This strategy leads to fused heterocyclic lactone scaffolds in a single step with moderate functional group tolerance and excellent site selectivity. Besides, in one step, an antipode of