Microwave-assisted synthesis of 3-substituted indoles via intramolecular arene–alkene coupling of o-iodoanilino enamines
摘要:
A generally applicable and high-yielding protocol for the synthesis of 3-substituted indole derivatives is described. Key features include microwave-assisted intramolecular arene alkene coupling of o-iodoanilino enamines, and expedient synthesis of o-iodoanilino enamine substrates employing N,O-acetal TMS ethers, which could be conveniently derived from the corresponding amides. Our unique procedure seems quite efficient and provides an easy access to a variety of 3-substituted indoles as privileged structure for a wide range of biological targets. (C) 2013 Elsevier Ltd. All rights reserved.
Microwave-assisted synthesis of 3-substituted indoles via intramolecular arene–alkene coupling of o-iodoanilino enamines
摘要:
A generally applicable and high-yielding protocol for the synthesis of 3-substituted indole derivatives is described. Key features include microwave-assisted intramolecular arene alkene coupling of o-iodoanilino enamines, and expedient synthesis of o-iodoanilino enamine substrates employing N,O-acetal TMS ethers, which could be conveniently derived from the corresponding amides. Our unique procedure seems quite efficient and provides an easy access to a variety of 3-substituted indoles as privileged structure for a wide range of biological targets. (C) 2013 Elsevier Ltd. All rights reserved.
The intramolecular carbolithiation of a series of chloro‐substituted alkynes leads to exocyclic alkylidene carbenoids of which both nucleophilic and electrophilic characters can be drove. A sole stereoselective 5‐exo‐dig addition takes place, probably because of a strong and persisting Li–Cl interaction arising before the transition state.