NHC-catalyzed Michael/Mannich/lactamization cascade reaction of enals with either indole-2-carboxaldehyde-derived aldimines or indole-7-carboxaldehyde-derived aldimines is described. This protocol enables the rapid assembly of optically active pyrroloindolones and pyrroloquinolinones derivatives under mild conditions with high yields, excellent enantioselectivities, and a broad substrate scope.
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。
Enantioselective Indole N–H Functionalization Enabled by Addition of Carbene Catalyst to Indole Aldehyde at Remote Site
作者:Xing Yang、Guoyong Luo、Liejin Zhou、Bin Liu、Xiaolei Zhang、Hui Gao、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/acscatal.9b03163
日期:2019.12.6
An enantioselective functionalization of the indole NH group is developed. The reaction stereoselectivity is controlled by an N-heterocyclic carbene catalyst that adds to an aldehyde moiety at the C7-carbon of indole. The NH group participating in the carbene-catalyzed reaction is part of the heteroaromatic rings of the indole substrate. Our reactions afford multicyclic products bearing pyrroloquinazoline