Iron(III)/Copper(II)-Cocatalyzed Cycloaddition/[3,3]-Rearrangement/N–O Bond Cleavage To Prepare Polysubstituted Pyrrolizines from <i>N</i>-Vinyl-α,β-Unsaturated Nitrones and Activated Alkynes
作者:Ning Zou、Ji-Wen Jiao、Yu Feng、Cheng-Xue Pan、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1021/acs.orglett.8b03767
日期:2019.1.18
An efficient one-pot synthesis of polysubstituted pyrrolizines from N-vinyl-α,β-unsaturated nitrones and activatedalkynesthrough iron(III)/copper(II)-cocatalyzed [3 + 2] cycloaddition/[3,3]-rearrangement and sequential N–O bond cleavage was developed. The reaction first underwent [3 + 2] cycloaddition and [3,3]-rearrangement to afford nine-membered N-heterocycles, and then a controlled N–O bond cleavage
MnSO<sub>4</sub>-promoted S–O bond cleavage for synthesizing functionalized sulfonium ylides from activated alkynes and sulfoxides
作者:Wei-Li Chen、Zhang-Wei Liu、Ying-Chun Wang、Xiao-Pan Ma、Dong-Liang Mo
DOI:10.1039/d1ob02491d
日期:——
A variety of functionalized sulfonium ylides were prepared in good yields through MnSO4-promoted S–O bond cleavage fromactivatedalkynes and sulfoxides. Experimental results showed that the MnSO4 catalyst played important roles in accelerating the reaction and promoting the [1,3]-rearrangement of the S–O bond. Furthermore, the product was easily obtained on a gram scale by simple recrystallization
The special pair of the bacterial photosystem has been modeled with a porphyrin dimer (the partial structure is shown). As with the natural system, only one pyrrole ring from each monomer subunit participates in πoverlap.