Hydrogen‐Bonding Assisted Catalytic Kinetic Resolution of Acyclic β‐Hydroxy Amides
作者:Arka Porey、Bhaskar Deb Mondal、Joyram Guin
DOI:10.1002/anie.202015004
日期:2021.4.12
Enantioenriched acyclic α‐substituted β‐hydroxy amides are valuable compounds in chemical, material and medicinal sciences, but their enantioselective synthesis remains challenging. A catalytic kinetic resolution (KR) of such amides with selectivity factor(s) up to >200 is developed via enantioselective acylation of primary alcohol with N‐heterocyclic carbene. An enhanced selectivity for the catalytic
Enantioselective synthesis of hindered cyclic dialkyl ethers via catalytic oxa-Michael/Michael desymmetrization
作者:Michael T. Corbett、Jeffrey S. Johnson
DOI:10.1039/c3sc51022k
日期:——
An asymmetricoxa-Michael/Michael cascade reaction of p-quinols and alpha,beta-unsaturated aldehydes provides access to hindered dialkyl ethers. A highly enantioselective oxa-Michael addition of a tertiary alcohol precedes an intramolecularcyclohexadienone desymmetrization, which allows for the concomitant formation of four contiguous stereocenters in a single step. The highly functionalized bicyclic
Silver-Catalyzed Vinylcarbene Insertion into C–C Bonds of 1,3-Diketones with Vinyl-<i>N</i>-triftosylhydrazones
作者:Yong Wu、Yongquan Ning、Xinyue Han、Peiqiu Liao、Ying Xia、Paramasivam Sivaguru、Xihe Bi
DOI:10.1021/acs.orglett.2c03176
日期:2022.11.11
We describe the silver-catalyzedformalinsertion of a vinylcarbene into unstrained C(CO)–C bonds of 1,3-diketones using vinyl-N-triftosylhydrazones as vinylcarbene precursors. This method allows the rapid synthesis of otherwise inaccessible 2-vinyl-substituted 1,4-diketones from relatively simple substrates. This mild catalytic protocol exhibits a good functional group tolerance and substrate scope
Rhodium‐Catalyzed One‐Carbon Ring Expansion of Aziridines with Vinyl‐N‐triftosylhydrazones for the Synthesis of 2‐Vinyl Azetidines
作者:Yongquan Ning、Hongzhu Chen、Yongyue Ning、Jin Zhang、Xihe Bi
DOI:10.1002/anie.202318072
日期:2024.3.18
A general skeletal ring expansion strategy for the direct conversion of aziridines into 2-vinyl azetidines via one-carbon insertion using vinyl-N-triftosylhydrazones is described. The method is scalable, tolerates diverse functional groups, and is amenable to the synthesis of medicinally relevant molecules.