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
Iodine-Mediated Electrophilic Cyclization of 2-Alkynyl-1-methylene Azide Aromatics Leading to Highly Substituted Isoquinolines and Its Application to the Synthesis of Norchelerythrine
作者:Dirk Fischer、Hisamitsu Tomeba、Nirmal K. Pahadi、Nitin T. Patil、Zhibao Huo、Yoshinori Yamamoto
DOI:10.1021/ja805326f
日期:2008.11.19
corresponding isoquinoline derivatives in excellent to allowable yields. Electron-donating and electron-accepting substituents on the aromatic ring were equally tolerated, and either acidic or basic (or even neutral) reaction conditions, depending on the reactivity of the substrate, could be applied to smoothly convert the azide starting materials into the desired isoquinoline products in moderate to good yields
Palladium‐Catalyzed Synthesis of 6
<i>H</i>
‐Dibenzo[
<i>c,h</i>
]chromenes and 5,6‐Dihydrobenzo[
<i>c</i>
]phenanthridines: Application to the Synthesis of Dibenzo[
<i>c,h</i>
]chromene‐6‐ones, Benzo[
<i>c</i>
]phenanthridines, and
<i>Arnottin I</i>
6H‐Dibenzo[c,h]chromenes and 5,6‐dihydrobenzo[c]phenanthridines have been synthesized via Palladium (II)‐catalyzed domino reactions of acetylenic substrates involving intramolecular trans‐oxo/amino palladation onto the triple bond followed by nucleophilic addition of the intermediate to a tethered cyano/aldehyde. The scope of this reaction was extended through one step conversion of some of the products
通过钯(II)催化的炔属底物的多米诺骨反应,合成了6 H-二苯并[ c,h ]色环和5,6-二氢苯并[ c ]菲啶,涉及分子内反式-羰基/氨基palpalation到三键,然后是亲核的将中间体加到束缚的氰基/醛中。通过将一些产物一步转化为6 H-二苯并[ c,h ]铬-6-6和苯并[ c ]菲啶扩大了反应的范围。这种方法的使用导致了天然产物Arnottin I的正式全合成。
Stereoselective Synthesis of Kalafungin Based on CuI‐Catalyzed Tandem Reactions of Arylethynes Containing an Ortho‐(1‐Hydroxyethyl) Substituent with Alkyl Diazoacetates
An isochromene synthesis is developed utilizing a cascade reaction involving a CuI catalyzed coupling reaction between an alkyne and diazoacetate followed by allenoate isomerization and subsequent oxa-Michael addition. The cascade sequence was also demonstrated for the synthesis of naphthalenes. Furthermore, the methodology developed herein was applied toward a stereoselectivesynthesis of pyranonaphthoquinone
异色烯合成是利用级联反应开发的,该反应涉及炔烃和重氮乙酸酯之间的 CuI 催化偶联反应,然后是烯丙酸酯异构化和随后的氧杂-迈克尔加成。级联序列也被证明用于合成萘。此外,本文开发的方法应用于吡喃萘醌卡拉芬净的立体选择性合成。