One-pot synthesis of 2,3,4,5,6-pentasubstituted tetrahydropyrans using lithiation–borylation, allylation and Prins cyclisation reactions
摘要:
2,3,4,5,6-Pentasubstituted tetrahydropyrans have been prepared in good yield (42-57%) with excellent dr (>95:5) and er (>95:5) using a one-pot lithiation-borylation, allylation and Prins cyclisation reaction. (C) 2012 Elsevier Ltd. All rights reserved.
Tandem Allylboration-Prins Reaction for the Rapid Construction of Substituted Tetrahydropyrans: Application to the Total Synthesis of (−)-Clavosolide A
作者:Alba Millán、James R. Smith、Jack L.-Y. Chen、Varinder K. Aggarwal
DOI:10.1002/anie.201511140
日期:2016.2.12
Tetrahydropyrans are common motifs in natural products and have now been constructed with high stereocontrol through a three-component allylboration-Prins reaction sequence. This methodology has been applied to a concise (13 steps) and efficient (14 % overall yield) synthesis of the macrolide (-)-clavosolide A. The synthesis also features an early stage glycosidation reaction to introduce the xylose