Convenient preparation of 4-diazoisochroman-3-imines and 3-subsituted 3,5-dihydroisochromeno[3,4-d][1,2,3]triazoles
作者:Anni Ren、Ping Lu、Yanguang Wang
DOI:10.1039/c7cc00603a
日期:——
A novel and convenientpreparation of 4-diazoisochroman-3-imines through the copper(I)-catalyzed cascade reaction of (2-ethynylphenyl)-methanols with sulfonyl azides is described. The synthesized cyclical [small alpha]-diazo imidates could readily react with a variety...
Synthesis of Highly Fused Pyrano[2,3-<i>b</i>]pyridines via Rh(III)-Catalyzed C–H Activation and Intramolecular Cascade Annulation under Room Temperature
作者:Xu Han、Feng Gao、Chunpu Li、Daqing Fang、Xiong Xie、Yu Zhou、Hong Liu
DOI:10.1021/acs.joc.9b03102
日期:2020.5.15
A facile access to the polycyclic-fused pyrano[2,3-b]pyridines has been established under room temperature via Rh(III)-catalyzed C-H bond activation and intramolecular cascade annulation. This strategy features high efficiency, unique versatility, and generality and it can occur under mild conditions in good to excellent yields. More importantly, this strategy can be extended to the late-stage functionalization
Sulfoximines-Assisted Rh(III)-Catalyzed C–H Activation and Intramolecular Annulation for the Synthesis of Fused Isochromeno-1,2-Benzothiazines Scaffolds under Room Temperature
作者:Bao Wang、Xu Han、Jian Li、Chunpu Li、Hong Liu
DOI:10.3390/molecules25112515
日期:——
proposed for the furnishing of highly fused isochromeno-1,2-benzothiazines scaffolds using S-phenylsulfoximides and 4-diazoisochroman-3-imine as substrates under room temperature. This method features diverse substituents and functional groups tolerance and relatively mild reaction conditions with moderate to excellent yields. Additionally, retentive configuration of sulfoximides in the conversion has
Tunable and Chemoselective Syntheses of Dihydroisobenzofurans and Indanones via Rhodium-Catalyzed Tandem Reactions of 2-Triazole-benzaldehydes and 2-Triazole-alkylaryl Ketones
作者:Hongjuan Shen、Junkai Fu、Jianxian Gong、Zhen Yang
DOI:10.1021/ol502617m
日期:2014.11.7
Two novel rhodium(II)-catalyzed tandem reactions were developed for the synthesis of dihydroisobenzofuran and indanone derivatives from 2-triazole-benzaldehydes and 2-triazole-alkylaryl ketones. Dihydroisobenzofuran derivatives were obtained in good yields with high regioselectivities when alcohols were used as nuclophiles in these reactions, whereas the replacement of the alcohol with water resulted
Au(I)/(<i>R</i>)-BINOL–Ti(IV) Concerted Catalyzed Asymmetric Cascade Cycloaddition Reaction of Arylalkynols
作者:Hongkai Wang、Tianlong Zeng、Weixing Chang、Lingyan Liu、Jing Li
DOI:10.1021/acs.orglett.1c00976
日期:2021.5.7
An efficient catalytic asymmetric cascade cycloadditionreaction of arylalkynols with dioxopyrrolidines was developed. This reaction was achieved using Au(I) and (R)-BINOL–Ti(IV) bimetallic catalysts and exclusively delivered a series of chiral oxo-bridged bicyclic benzooxacine compounds in up to 86% yield with 96% ee as well as >33:1 dr. Meanwhile, three new σ bonds and three new stereogenic centers