摘要:
                                An asymmetric synthesis of (-)-E-delta-viniferin, a trans-resveratrol dimer natural product containing a dihydrobenzofuran ring, has been achieved by exploiting a Rh(II)-catalyzed intramolecular C-H insertion reaction of a diaryldiazomethane derivative as a key step. The C-H insertion under catalysis by dirhodium(II) tetrakis[N-tetrafluorophthaloyl-(S)-tert-leucinate], Rh-2(S-TFPTTL)(4), provided the 2,3-diaryl-2,3-dihydrobenzofuran core structure with perfect cis diastereoselectivity and 96% ee. (c) 2015 Elsevier Ltd. All rights reserved.