Asymmetric Synthesis of Dihydronaphthoquinones Containing Adjacent Stereocenters via a Sulfa-Michael Addition Triggered Ring-Expansion Approach
摘要:
A novel asymmetric synthetic approach for the construction of enantioenriched functionalized dihydroquinones incorporating adjacent quaternary and tertiary stereocenters has been reported, in which enantioenriched 3-allylic phthalides engaged in an unprecedented sulfa-Michael addition-triggered Stereoselective ring-expansion reaction, and furnished the desired sulfur-incoporated dihydronaphthoquinones with high stereoselectivity.
Enantioselective synthesis of spirocyclic cyclopentenes: asymmetric [3+2] annulation of 2-arylideneindane-1,3-diones with MBH carbonates derivatives catalyzed by multifunctional thiourea–phosphines
作者:Fangle Hu、Yin Wei、Min Shi
DOI:10.1016/j.tet.2012.07.013
日期:2012.9
The [3+2] annulation reactions of 2-arylideneindane-1,3-diones with Morita–Baylis–Hillman (MBH) carbonates proceeded smoothly in the presence of multifunctional thiourea–phosphines to produce the corresponding quaternary carbon centered spirocyclic cyclopentenes in moderate yields, with high diastereoselectivities and enantioselectivities under mild conditions. The plausible reaction has been also
Asymmetric P−C Bond Formation: Diastereoselective Synthesis of Adjacent P,C-Stereogenic Allylic Phosphorus Compounds
作者:Peizhong Xie、Lei Guo、Lanlan Xu、Teck-Peng Loh
DOI:10.1002/asia.201600108
日期:2016.5.6
A novel catalytic asymmetric P−C bond formation between phosphinates/phosphine oxide and allylic carbonates was developed. This methodology could not only afford a variety of functionalized adjacent P,C‐stereogenic phosphorus compounds in high yields with high regio‐ and diastereoselectivities but also provide an alternative strategy to access enantiomerically enriched (SP)‐phosphinates through kinetic
Phosphine‐Mediated Domino Benzannulation Strategy for the Construction of Highly Functionalized Multiaryl Skeletons
作者:Peizhong Xie、You Huang、Ruyu Chen
DOI:10.1002/chem.201200305
日期:2012.6.11
A skeleton crew: A phosphine‐mediateddominobenzannulationstrategy was developed for the synthesis of multiarylskeletons (see scheme). A wide range of aromatic compounds and functional groups can be assembled into a multiaryl molecule through a core domino process.
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.
Asymmetric Construction of Functionalized Bicyclic Imides via [3 + 2] Annulation of MBH Carbonates Catalyzed by Dipeptide-Based Phosphines
作者:Fangrui Zhong、Guo-Ying Chen、Xiaoyu Han、Weijun Yao、Yixin Lu
DOI:10.1021/ol301647g
日期:2012.7.20
A highly enantioselective [3 + 2] annulation of MBH carbonates and maleimides catalyzed by chiral phosphines has been developed. In the presence of 5 mol % of L-Thr-L-Val-derived phosphine 6, functionalized bicyclic imides were prepared in excellent yields, and with high diastereoselectivities and nearly perfect enantioselectivities.