Sulfur-assisted propargyl–allenyl isomerizations and intramolecular cyclization for the synthesis of tricyclic thiophene derivatives
摘要:
A facile and efficient cyclization for the synthesis of tricyclic thiophene derivatives was developed. As a metal-free process, a result of the ready availability of the starting materials and the simple and convenient operation, the type of reaction presented here has potential utility in organic synthesis. (C) 2010 Elsevier Ltd. All rights reserved.