Stereoselective synthesis of organosulfur compounds incorporating N-aromatic heterocyclic motifs and quaternary carbon centers via a sulfa-Michael triggered tandem reaction
The novel sulfa-Michael addition (SMA)-triggered tandem reaction was developed by combining a SMA reaction with a simultaneous rearomatization process.
Lewis Base-Catalyzed One-Pot Cascade Sequences of <i>O</i>-Alkenyl-Substituted Cyanohydrins: Diastereoselective Synthesis of Multisubstituted Dihydrofurans
作者:Shan-Tao Du、Zhen Sun、Wei Liu、Wei-Wei Liao
DOI:10.1021/acs.orglett.7b03301
日期:2017.12.15
of the diastereoselective construction of polysubstituted 2,3-dihydrofurans incorporating contiguousquaternary and tertiarycarbon centers via a Lewis base-catalyzed one-pot cascade sequence is described. The diversity and complexity of the final products can be efficiently constructed with high diastereoselectivities via this catalytic multistep process under mild reaction conditions.
Highly Enantioselective Regiodivergent Allylic Alkylations of MBH Carbonates with Phthalides
作者:Fangrui Zhong、Jie Luo、Guo-Ying Chen、Xiaowei Dou、Yixin Lu
DOI:10.1021/ja303115m
日期:2012.6.20
Phthalides were used for the first time in the allylic alkylation reactions with MBH carbonates for the creation of chiral 3,3-disubstituted phthalides. Highly enantioselective regiodivergent synthesis of gamma-selective or beta-selective allylic alkylation products was achieved by employing bifunctional chiral phosphines or multifunctional tertiary amine-thioureas as the catalyst, respectively. It was demonstrated that proper selection of catalysts and reaction conditions would differentiate an S(N)2'-S(N)2' pathway and an addition-elimination process, yielding different regioisomers of the allylic alkylation products in a highly enantiomerically pure form.