Synthesis of 2-substituted chromenes via ring-closing metathesis and stable 1-benzopyrylium ions
摘要:
2-Substituted chromenes were obtained via combination of ring-closing metathesis of allylic acetals to the corresponding cyclic acetals, followed by Lewis acid-mediated functionalization of the resulting stable 1-benzopyrylium ion with suitable nucleophiles. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of 2-substituted chromenes via ring-closing metathesis and stable 1-benzopyrylium ions
摘要:
2-Substituted chromenes were obtained via combination of ring-closing metathesis of allylic acetals to the corresponding cyclic acetals, followed by Lewis acid-mediated functionalization of the resulting stable 1-benzopyrylium ion with suitable nucleophiles. (C) 2000 Elsevier Science Ltd. All rights reserved.
2-Substituted chromenes were obtained via combination of ring-closing metathesis of allylic acetals to the corresponding cyclic acetals, followed by Lewis acid-mediated functionalization of the resulting stable 1-benzopyrylium ion with suitable nucleophiles. (C) 2000 Elsevier Science Ltd. All rights reserved.