α-Chiral Amines via Thermally Promoted Deaminative Addition of Alkylpyridinium Salts to Sulfinimines
作者:Kristen M. Baker、Amanda Tallon、Richard P. Loach、Olivia P. Bercher、Matthew A. Perry、Mary P. Watson
DOI:10.1021/acs.orglett.1c02708
日期:2021.10.15
A deaminative reaction of Katritzky alkylpyridinium salts and sulfinimines has been developed to deliver enantiopure α-chiral amines. The success of this method relied on the discovery of a thermally promoted deamination via single-electron transfer of an anion−π complex of the alkylpyridinium cation with potassium carbonate. This method boasts excellent diastereoselectivity over the α-stereocenter
Synthesis of amino-diamondoid pharmacophores <i>via</i> photocatalytic C–H aminoalkylation
作者:William K. Weigel、Hoang T. Dang、Hai-Bin Yang、David B. C. Martin
DOI:10.1039/d0cc02804e
日期:——
direct C–H aminoalkylation reaction using two light-activated H-atom transfer catalyst systems that enable the introduction of protected amines to native adamantane scaffolds with C–C bond formation. The scope of adamantane and imine reaction partners is broad and deprotection provides versatile amine and amino acid building blocks. Using readily available chiral imines, the enantioselective synthesis
我们报告了使用两种光活化 H 原子转移催化剂系统的直接 C-H 氨基烷基化反应,该反应能够将受保护的胺引入具有 C-C 键形成的天然金刚烷支架。金刚烷和亚胺反应伙伴的范围很广,去保护提供了通用的胺和氨基酸构建块。使用容易获得的手性亚胺,还描述了沙格列汀核心和金刚乙胺衍生物的对映选择性合成。
Asymmetric Synthesis of Trisubstituted Aziridines via Aza-Darzens Reaction of Chiral Sulfinimines
作者:Toni Moragas、Ian Churcher、William Lewis、Robert A. Stockman
DOI:10.1021/ol502967x
日期:2014.12.19
reaction of substituted 2-bromoesters with chiral tert-butane- and mesitylsulfinimines provides a rapid access to a range of highly substituted aziridines in good yields and excellent levels of stereoselectivity. The synthetic potential of this protocol is further enhanced by the successful removal of the sulfinyl motif, yielding simple access to chiral N–H aziridines in just three steps from commercial aldehyde
Enantiomerically enriched sulfonamides were synthesized by the radical addition of an acetal to enantiomerically pure N-sulfinyl imines using dimethylzinc–air and boron trifluoride diethyl etherate. Higher levels of stereocontrol were observed by using a mesitylenesulfinyl group. Furthermore, an amine and an amino alcohol with high enantiomeric purity were obtainable from the sulfonamide product.