An efficient asymmetric dearomative [3+2] cycloadditionreaction of 2‐nitroindoles and 2‐nitrobenzothiophenes with 3‐isothiocyanato oxindoles was developed by using a chiral Zn(OTf)2/bis(oxazoline) complex as a catalyst. With the developed protocol, a range of enantioenriched complex heterocyclic compounds containing three contiguous stereocenters, one of which is spirocyclic center, could be obtained
Catalytic Asymmetric Michael Addition/Cyclization Cascade Reaction of 3-Isothiocyanatooxindoles with Nitro Olefins
作者:Satavisha Kayal、Santanu Mukherjee
DOI:10.1002/ejoc.201402534
日期:2014.10
asymmetric reaction of 3-isothiocyanatooxindoles with nitroolefins has been developed by using a cinchonidine-derived bifunctional catalyst. The resulting products, highly functionalized 3,2-pyrrolidinyl-substituted spirooxindole derivatives, were obtained in high yields with good diastereo- and enantioselectivities (up to dr >20:1 and er = 96:4). This Michael addition/cyclization cascade reaction employs
3-异硫氰酸根合吲哚与硝基烯烃的第一个有机催化不对称反应是通过使用辛可尼丁衍生的双功能催化剂开发的。所得产物是高度官能化的 3,2-吡咯烷基取代的螺吲哚衍生物,以高产率获得,具有良好的非对映选择性和对映选择性(高达 dr > 20:1 和 er = 96:4)。这种迈克尔加成/环化级联反应使用单取代的硝基烯烃,并补充了 Zn-II 催化的变体,后者仅适用于二取代的硝基烯烃。
Catalytic Enantioselective Ring-Opening and Ring-Closing Reactions of 3-Isothiocyanato Oxindoles and <i>N</i>-(2-Picolinoyl)aziridines
作者:Linqing Wang、Dongxu Yang、Dan Li、Rui Wang
DOI:10.1021/acs.orglett.5b01291
日期:2015.6.19
applied to an asymmetric formal [3 + 3] cycloaddition reaction with aziridines for the first time. The reaction was efficiently mediated by an in situ generated magnesium catalyst employing (R)-3,3′-fluorous-BINOL as a simple chiral ligand. Serials of polycyclic frameworks could be obtained after a ring-closing step. The enantioenriched ring-opening product was also utilized to modified amino acids, peptides
Efficient synthesis of functionalized spiro[imidazolidine-2-thione-oxindoles] via catalyst-free domino Mannich cyclization
作者:Xin-Ni Ping、Wei Chen、Xiao-Yan Lu、Jian-Wu Xie
DOI:10.24820/ark.5550190.p009.932
日期:——
An efficient protocol has been developed for the synthesis of spiro[imidazolidine-2-thioneoxindole] derivatives with multi-functionalized groups viacatalyst-freedomino reaction of by dominoMannich/cyclization of 3-isothiocyanato oxindoles and bis(arylmethylidene)hydrazines. The domino reaction can proceed smoothly in an environmentally benign conditions and provides pure functionalizedspiro[im
Enantioselective Synthesis of Spirooxindoles: Asymmetric [3+2] Cycloaddition of (3-Isothiocyanato)oxindoles with Azodicarboxylates
作者:Yu Jiang、Cheng-Kui Pei、Dan Du、Xiao-Ge Li、Ya-Nan He、Qin Xu、Min Shi
DOI:10.1002/ejoc.201301418
日期:2013.12
asymmetric [3+2] cycloaddition of (3-isothiocyanato)oxindoles with azodicarboxylates has been explored in the presence of (DHQD)2PHAL. It affords spirooxindoles having two heterocycles at their C3′-position in excellent yields, with high enantioselectivities, and under mild conditions within 5 min. Moreover, another spirooxindole derived from the reaction of (3-isothiocyanato)oxindole with two molecules