Synthesis of 2,2′-bipyrrole-5-carboxaldehydes and their application in the synthesis of B-ring functionalized prodiginines and tambjamines
作者:Papireddy Kancharla、Kevin A. Reynolds
DOI:10.1016/j.tet.2013.07.067
日期:2013.9
Facile, versatile, and cost-effective synthetic routes for the preparation of a range of new 3-alkyl-, 4-alkyl-, 3,4-dialkyl-, and 3-halo-4-alkyl-2,2′-bipyrrole-5-carboxaldehydes have been developed. These 2,2′-bipyrrole-5-carboxaldehydes offer interesting potential as building blocks for making bioactive natural and unnatural products, as demonstrated by the synthesis of B-ring functionalized prodiginines
Development of two processes for the synthesis of bridged azabicyclic systems: intermolecular radical addition–homoallylic rearrangements leading to 2-azanorborn-5-enes and neophyl-type radical rearrangements to 2-azabenzonorbornanes
作者:David M. Hodgson、Magnus W. P. Bebbington、Paul Willis
DOI:10.1039/b306717n
日期:——
Radical thiol additions to 7-azanorbornadienes give 7-thio-substituted 2-azanorbornenes and Barton deoxygenations of 7-azabenzonorbornanols give 2-azabenzonorbornanes. The processes both involve novel nitrogen-directed radicalrearrangements. The kinetics and mechanisms of the reactions are also discussed.
The Rh4(CO)12-catalyzed hydroformylation at low temperature (40°C) of the 1-, 2- and 3-vinylpyrrole gives the corresponding branched aldehydes 2-(1-pyrrolyl)propanal, 2-(2-pyrollyl)propanal and 2-(3-pyrrolyl)propanal with high α-regioselectivity.
Pyrrole Hemithioindigo Antimitotics with Near‐Quantitative Bidirectional Photoswitching that Photocontrol Cellular Microtubule Dynamics with Single‐Cell Precision**
作者:Alexander Sailer、Joyce C. M. Meiring、Constanze Heise、Linda N. Pettersson、Anna Akhmanova、Julia Thorn‐Seshold、Oliver Thorn‐Seshold
DOI:10.1002/anie.202104794
日期:2021.10.25
first cellular application of the emerging near-quantitative photoswitchpyrrolehemithioindigo, by rationally designing photopharmaceutical PHTub inhibitors of the cytoskeletal protein tubulin. PHTubs allow simultaneous visible-light imaging and photoswitching in live cells, delivering cell-precise photomodulation of microtubuledynamics, and photocontrol over cell cycle progression and cell death
作者:Zheng‐Jun Wang、Xiangyang Chen、Lei Wu、Jonathan J. Wong、Yong Liang、Yue Zhao、Kendall N. Houk、Zhuangzhi Shi
DOI:10.1002/anie.202016573
日期:2021.4.6
conspicuously underdeveloped. Here, we develop a general strategy for the site‐selective C−Hborylation of pyrroles by using only BBr3 directed by pivaloyl groups, avoiding the use of any metal. The site‐selectivity is generally dominated by chelation and electronic effects, thus forming diverse C2‐borylated pyrroles against the steric effect. The formed products can readily engage in downstream transformations