A novel carbon electrophile induced intermolecular oxa-Diels–Alder/semipinacolrearrangement/aldol cascade reaction of allylic silyl ether with β,γ-unsaturated α-ketoester has been developed under the promotion of SnCl4. This highly efficient transformation enables the quick construction of polycyclic architectures with up to five contiguous stereogenic centers in a single operation with moderate to
A Facile Approach to Oximes and Ethers by a Tandem NO
<sup>+</sup>
‐Initiated Semipinacol Rearrangement and H‐Elimination
作者:Jia‐Wei Dong、Tongmei Ding、Shu‐Yu Zhang、Zhi‐Min Chen、Yong‐Qiang Tu
DOI:10.1002/anie.201807861
日期:2018.10
NO+‐initiated semipinacol rearrangement and subsequent proton elimination. The procedure enabled the rapid construction of a series of oximes and oxime ethers with spiro quaternary stereocenters from allylic silyl ethers. Additional features of this reaction include wide substrate tolerance as well as the commercial availability of the safe nitrosation reagent NOBF4. The key N‐heterotricyclic cores of three natural
作者:Qing-Wei Zhang、Xiao-Bo Zhang、Bao-Sheng Li、Kai Xiang、Fu-Min Zhang、Shao-Hua Wang、Yong-Qiang Tu
DOI:10.1039/c2cc38585f
日期:——
A catalytic intermolecular carbon electrophile induced semipinacol rearrangement was realized and the asymmetric version was also preliminarily accomplished with 92% and 82% ee. The complex tricyclic system architecture with four continuous stereogenic centers could be achieved from simple starting materials in a single step under mild conditions.