Flexible Tetrahydropyran Synthesis from Homopropargylic Alcohols Using Sequential Pd–Au Catalysis
作者:Jungjoon Kim、Wook Jeong、Young Ho Rhee
DOI:10.1021/acs.orglett.6b03532
日期:2017.1.6
flexible synthetic method toward highly substituted tetrahydropyran is reported. The key transformation involves atom-efficient sequential metal catalysis consisting of Pd-catalyzed addition of homopropargylicalcohols to alkoxyallene and the subsequent gold(I)-catalyzed cycloisomerization. Notably, this method gives access to both 2,6-cis- and 2,6-trans-tetrahydropyrans possessing diverse substitution patterns
Pd-Catalyzed Regioselective Asymmetric Addition Reaction of Unprotected Pyrimidines to Alkoxyallene
作者:Soyeong Kang、Seok Hyeon Jang、Juyeol Lee、Dong-gil Kim、Mijin Kim、Wook Jeong、Young Ho Rhee
DOI:10.1021/acs.orglett.7b02332
日期:2017.9.1
asymmetric synthesis of N-heterocyclic glycosides free of protecting and directing groups is reported. The key reaction is highlighted by the atom-efficient and regioselective addition of unprotected pyrimidines to highly functionalized alkoxyallene. Numerous acyclic and cyclic N-heterocyclic glycosides are accessed with minimal formation of organic byproducts. The synthetic utility of the reaction is demonstrated
Microwave Promoted Rapid Isomerisation of Propargyl Ethers into Allenyl Ethers
作者:Firouz Matloubi Moghaddam、Rahdar Emami
DOI:10.1080/00397919708005453
日期:1997.12
Abstract: Aryl or alkyl propargyl ethers have been isomerized efficiently with good to excellent yield into corresponding allenylethers in the presence of potassium tert-butoxide under the microwave irradiation.
Stereodefined <i>N,O</i>-Acetals: Pd-Catalyzed Synthesis from Homopropargylic Amines and Utility in the Flexible Synthesis of 2,6-Substituted Piperidines
作者:Haejin Kim、Young Ho Rhee
DOI:10.1021/ja2116298
日期:2012.3.7
N,O-acetals. The key to this strategy, chemo- and stereoselective synthesis of N,O-acetals, was achieved by the Pd-catalyzed addition of sulfonyl-protected homopropargylic amines to alkoxyallene. The N,O-acetals generated in this way were combined with Au-catalyzed cycloisomerization to give an access to 2,6-disubstitutedpiperidines with stereochemical flexibility.
我们开发了一种概念上新的合成策略,该策略利用不稳定的无环 N,O-缩醛的立体化学信息。该策略的关键,N,O-缩醛的化学和立体选择性合成,是通过 Pd 催化将磺酰基保护的高炔丙胺加成到烷氧基丙二烯上来实现的。以这种方式生成的 N,O-缩醛与 Au 催化的环异构化相结合,以提供具有立体化学灵活性的 2,6-二取代哌啶。
Synthetic Study toward Saccharomicin Based upon Asymmetric Metal Catalysis
作者:Bhawna Barpuzary、Mijin Kim、Young Ho Rhee
DOI:10.1021/acs.orglett.1c02060
日期:2021.8.6
metal-catalyzed approach toward the stereoselective glycosidic bond formation in saccharomicin. The signature step is highlighted by the Pd-catalyzed asymmetric coupling of ene-alkoxyallenes and highly functionalized alcohol substrates. The reaction showed high chemo-, regio-, and ligand-driven diastereoselectivity. In combination with the ring-closing metathesis and late-stage functionalization, this method