Allyliccarbonates were more active than the corresponding allylic acetates in carbonylallylationusingPdCl2(PhCN)2-SnCl2, and the carbonylallylation by (E)-crotyl carbonate at 10 °C exhibited opposite diastereo-selectivity (anti-selectivity) to that by (E)-crotyl acetate at 60 ° C.
A method for the synthesis of alpha-chiral allylboronates featuring the Cu(I)-catalyzed enantioselective substitution of readily available allylic carbonates with a diboron is described. Using this method, various alpha-chiral allylboronates, including functionalized allylboronates, were successfully synthesized, with high enantiomeric purity.
Structurally defined anti-π-allyliridium complexes catalyse Z-retentive asymmetric allylic alkylation of oxindoles
作者:Ru Jiang、Qing-Ru Zhao、Chao Zheng、Shu-Li You
DOI:10.1038/s41929-022-00879-z
日期:——
highly efficient catalysts that enable Z-retentive asymmetricallylicalkylation of oxindoles accommodating a wide substrate scope. An iridium catalyst with a different metal-to-ligand ratio from that of a similar catalyst reported in the literature has been found to be crucial for regioselective nucleophilic attack at the less substituted allylic terminus. This simple yet powerful approach lays a
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