Halocyclization of 2-alkynylthioanisoles by cupric halides: synthesis of 2-substituted 3-halobenzo[b]thiophenes
摘要:
Reaction of 2-alkynylthioanisoles 3 with 2 equiv of CuX2 (X=Br or Cl) in refluxing CH3CN for 2.5 h gave the 2-substituted 3-halobenzo[b]thiophenes 4 in good yields. (c) 2006 Elsevier Ltd. All rights reserved.
The reactivity of fluoroalkylselenotoluenesulfonates with unsaturated substrates is explored herein. The direct activation of these shelf-stable reagents under visible light allows the double functionalisation of alkenes or alkynes efficiently, leading to a wide range of β-fluoroalkylselenolated sulfones. Mechanistic investigations have been undertaken supporting the formation of radical intermediates
A clean and efficient electrochemical method for the preparation of 3-thio/selenocyanatobenzothiophenes has been developed. This method features excellent functional group compatibility, broad substrate scope and easy to scale-up in continuous flow.