Redox-Neutral [4 + 2] Annulation of <i>N</i>-Methoxybenzamides with Alkynes Enabled by an Osmium(II)/HOAc Catalytic System
作者:Jian Yang、Liexin Wu、Huiying Xu、Hui Gao、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.9b03827
日期:2019.12.20
C-H activation strategy, an efficient osmium(II)-catalyzed redox-neutral [4 + 2] annulation of N-methoxybenzamides with alkynes has been accomplished. Computational and experimental studies revealed that such transformation leading to the synthesis of the isoquinolone core might follow an Os(II)-Os(IV)-Os(II) catalytic pathway, in which an unusual HOAc-assisted oxidative addition of osmium(II) into
Palladium‐Catalyzed Inert C−H Bond Activation and Cyclocarbonylation of Isoquinolones with Carbon Dioxide Leading to Isoindolo[2,1‐
<i>b</i>
]isoquinoline‐5,7‐Diones
作者:Kelu Yan、Junbin Jin、Yong Kong、Bin Li、Baiquan Wang
DOI:10.1002/adsc.201900305
日期:2019.7.2
A palladium‐catalyzedinertC−Hbondactivation and cyclocarbonylation of isoquinolonesleading to isoindolo[2,1‐b]isoquinoline‐5,7‐diones under 1 atm of carbondioxide has been developed. This transformation features high regio‐ and chemo‐selectivity, step‐economy, and good functional group tolerance. Most of the corresponding products were obtained in moderate to good yields. It offers an alternative
已开发出在1个大气压的二氧化碳下,钯催化的惰性C-H键活化和异喹诺酮的环羰基化反应,导致异吲哚并[2,1 – b ]异喹啉-5,7-二酮。这种转变具有很高的区域选择性和化学选择性,逐步经济性和良好的官能团耐受性。大部分相应的产品以中等到良好的产率获得。它为合成有用的多种异吲哚并[2,1 - b ]异喹啉-5,7-二酮衍生物提供了另一种方法。
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.
isoindolinones via the direct coupling of N -methoxybenzamides and bis(tosylamido)methane with rhodium(III) as catalyst has been developed. The reaction is performed under mild conditions, without oxidant, and is compatible with various functional groups. Compared with the previously reported method for constructing isoindolinone skeletons, this method involves a novel [3+2] cyclization, and affords a wide
Ruthenium(II) catalysis allowed for regioselective annulations of challenging ferrocenylalkynes by oximes or N‐methoxybenzamides through isohypsicCH/NObondfunctionalization to furnish substituted isoquinolines and NH‐free isoquinolones with ample scope.
允许由肟或挑战ferrocenylalkynes的区域选择性annulations钌(II)催化Ñ -methoxybenzamides通过isohypsicÇ H /Ñ O键的官能化,得到取代的异喹啉和NH -free异喹诺酮与足够的范围。