Catalytic Asymmetric Synthesis of Piperidine Derivatives through the [4 + 2] Annulation of Imines with Allenes
作者:Ryan P. Wurz、Gregory C. Fu
DOI:10.1021/ja053277d
日期:2005.9.1
there has been only very limited progress in achieving asymmetric catalysis with chiral phosphines. In this report, the first highly enantioselective variant of the Kwon annulation of imines with allenes is described. Thus, C2-symmetric chiral phosphepine 1 serves as an effective catalyst for this powerful process, furnishing an array of functionalized piperidine derivatives with very good stereoselectivity
Stereoselective Synthesis of Functionalized Benzooxazepino[5,4-<i>a</i>]isoindolone Derivatives via Cesium Carbonate Catalyzed Formal [5 + 2] Annulation of 2-(2-Hydroxyphenyl)isoindoline-1,3-dione with Allenoates
作者:Chao Yao、Yishu Bao、Tao Lu、Qingfa Zhou
DOI:10.1021/acs.orglett.8b00382
日期:2018.4.20
In this work, we present a strategy for the stereoselective synthesis of functionalized benzooxazepino[5,4-a]isoindolone derivatives via a Cs2CO3-catalyzed domino β-addition and γ-aldol reaction of 2-(2-hydroxyphenyl)isoindoline-1,3-dione derivatives with allenoates, which offers an avenue for a combination of the structural unity between benzooxazepine and isoindolone motifs in synthetically useful
在这项工作中,我们提出了一种通过Cs 2 CO 3催化的多米诺骨牌β加成和2-(2-羟基苯基)异吲哚啉的γ-醛醇缩合反应立体选择性合成官能化的苯并氧杂庚环[5,4- a ]异吲哚酮衍生物的策略。-1,3-二酮衍生物与脲基甲酸酯,为在温和条件下具有高立体选择性的合成有用的收率提供了苯并氧杂pine庚因和异吲哚酮基序之间结构统一的途径。值得注意的是,这是2-(2-羟苯基)异吲哚啉-1,3-二酮与烯丙酸酯进行高度立体选择性Cs 2 CO 3催化的正式[5 + 2]环成环的第一个实例。
Synthesis of Spirobidihydropyrazole through Double 1,3-Dipolar Cycloaddition of Nitrilimines with Allenoates
The double 1,3-dipolar cycloaddition of allenoates with nitrilimines has been achieved under mild reaction conditions, affording a variety of spirobidihydropyrazoles in moderate to excellent yields with excellent diastereoselectivities. The reaction diastereoselectively constructs double dihydropyrazole moieties and two chiral centers including a spiro carbon center.
Utility of Bifunctional <i>N</i>-Heterocyclic Phosphine (NHP)-Thioureas for Metal-Free Carbon–Phosphorus Bond Construction toward Regio- and Stereoselective Formation of Vinylphosphonates
作者:Karimulla Mulla、Kyle L. Aleshire、Paul M. Forster、Jun Yong Kang
DOI:10.1021/acs.joc.5b02184
日期:2016.1.4
practical protocol for completely regioselective and highly stereoselective synthesis of vinyldiazaphosphonates from N-heterocyclic phosphine (NHP) and allenes via phospha-Michael/intramolecular nucleophilic substitution reaction has been developed. This transformation enabled the synthesis of valuable densely functionalized vinyldiazaphosphonates with a β-, γ-unsaturated ester moiety under mild reaction