DEAD-Mediated Oxidative Ugi/Aza-Wittig Reaction for the Synthesis of 5-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-1,3,4-oxadiazoles Starting from (N-Isocyanimine)triphenylphosphorane
作者:Ming-Wu Ding、Mei Sun、Long Zhao、Yan-Ling Yu
DOI:10.1055/s-0040-1705967
日期:2021.4
A one-pot protocol for the synthesis of 5-(1,2,3,4-tetrahydroisoquinolin-1-yl)-1,3,4-oxadiazoles via DEAD-mediated oxidative Ugi/aza-Wittigreaction has been developed. The reaction of (N-isocyanimine)triphenylphosphorane, carboxylic acids, and N-aryl-1,2,3,4-tetrahydroisoquinolines produced polysubstituted 5-(1,2,3,4-tetrahydroisoquinolin-1-yl)-1,3,4-oxadiazoles directly in good yields in the presence
Aerobic α‐Oxidation of N‐Substituted Tetrahydroisoquinolines to Dihydroisoquinolones via Organo‐photocatalysis
作者:Kim Aganda、Boseok Hong、Anna Lee
DOI:10.1002/adsc.201801301
日期:——
An efficient visible‐light‐induced α‐oxidation of N‐substituted tetrahydroisoquinolines to dihydroisoquinolones has been developed using eosinY as an organo‐photocatalyst and oxygen as a green oxidant. The reactions were carried out under mild reaction conditions; the desired dihydroisoquinolones were obtained in up to 96% yield at room temperature under oxygen atmosphere. This transformation provides
Titanium tetrachloride-mediated synthesis of N-aryl-substituted azacycles from cyclic ethers
作者:Zunming Sun、Shanshan Hu、Yan Huo、Zhihong Wang
DOI:10.1039/c6ra27325d
日期:——
Titaniumtetrachloride-mediated transformation of five- and six-membered cyclic ethers to the corresponding N-aryl-substituted azacycles is conducted in moderate to good yields under mild reaction conditions. Computational studies suggested a mechanism involving a Lewis acid-assisted ring-opening, a seven-membered metallacycle intermediate and a ring-closing process facilitated by direct participation
g (CDC) reaction between N-aryl-tetrahydroisoquinolines and 4-hydroxycoumarins has been realized. This protocol provides a green, mild and fast method to construct 3-tetrahydroisoquinoline substitutedcoumarins in the absence of any catalysts and exogenous oxidants. A variety of N-aryl-tetrahydroisoquinolines and 4-hydroxycoumarins are compatible with this transformation to give the corresponding products