据报道,在氧化的N-杂环卡宾催化条件下,吲哚NH键可用于对映体选择性合成生物学上重要的吡咯并喹啉衍生物。吲哚衍生物对催化生成的手性α,β-不饱和酰基acy的截获以aza-Michael / Michael /内酯化顺序进行,从而以高收率,非对映选择性和对映选择性传递吡咯并喹啉衍生物。在极性非质子溶剂中观察到的反应性和选择性的同时提高是值得注意的。
A rhodium(<scp>ii</scp>) catalysed domino synthesis of azepino fused diindoles from isatin tethered<i>N</i>-sulfonyl-1,2,3-triazoles and indoles
作者:Nilesh Kahar、Pankaj Jadhav、R. V. Ramana Reddy、Sudam Dawande
DOI:10.1039/c9cc08377d
日期:——
An efficient and convenient protocol for the synthesis of a novel class of azepino fused diindoles from isatin tethered N-sulfonyl-1,2,3-triazoles and indoles has been disclosed. The reaction proceeds via denitrogenative aza-vinyl rhodium carbene formation to give a carbonyl ylide, which with indole results in 1,3-dipolar cycloaddition followed by sequential semipinacol rearrangement/ring expansion/oxidation
Compounds of formula (I)
and pharmaceutically acceptable salts thereof are agonists at the beta-2 adrenoceptor. They are useful as feed additives for livestock animals.
Phosphine-Mediated Sequential [2+4]/[2+3] Annulation to Construct Pyrroloquinolines
作者:Junhui Lin、Yannan Zhu、Wei Cai、You Huang
DOI:10.1021/acs.orglett.1c04388
日期:2022.3.4
A domino [2+4]/[2+3] sequentialannulation reaction of MBH carbonates with N-unprotected indoles has been developed to provide various pyrroloquinoline derivatives in ≤94% yield and 20:1 dr. The reaction could be either mediated by stoichiometric PCy3 or catalyzed by R3PO via PIII/PV═O redox cycling in the presence of phenylsilane. This method assembles polycyclic 1,7-fused indoles in one step diastereoselectively
MBH 碳酸盐与 N-未保护的吲哚的多米诺 [2+4]/[2+3] 顺序环化反应已被开发,以提供≤94% 产率和 20:1 dr 的各种吡咯并喹啉衍生物。该反应可以由化学计量的 PCy 3介导,也可以由 R 3 PO 在苯基硅烷存在下通过 P III /P V = O 氧化还原循环催化。该方法一步非对映选择性地组装多环 1,7-稠合吲哚。
Aminocatalyzed Cascade Synthesis of Enantioenriched 1,7-Annulated Indoles from Indole-7-Carbaldehyde Derivatives and α,β-Unsaturated Aldehydes
enantioselective synthesis of 1,7-annulated indoles based on iminium-enamine activation. A careful study of the indole substitution pattern revealed that a chloro substituent at the C-3 position was important to the implementation of the reaction. Employing a diphenylprolinol silyl ether catalyst, a range of 3-chloro-1H-indole-7-carbaldehyde derivatives reacted with α,β-unsaturated aldehydes to afford the