Tandem Decarboxylative Cyclization/Alkenylation Strategy for Total Syntheses of (+)-Longirabdiol, (−)-Longirabdolactone, and (−)-Effusin
作者:Jianpeng Zhang、Zijian Li、Junming Zhuo、Yue Cui、Ting Han、Chao Li
DOI:10.1021/jacs.9b03978
日期:2019.5.22
Structurally complex and bioactive ent-kaurane diterpenoids have well-characterized biological functions and have drawn widespread attention from chemists for many decades. However, construction of highly oxidized forms of such diterpenoids still presents considerable challenges to synthetic chemists. Herein, we report the first totalsyntheses of C19 oxygenated spiro-lactone ent-kauranoids, including
Structure–activity relationship study at the 3′-N-position of paclitaxel: synthesis and biological evaluation of 3′-N-acyl-paclitaxel analogues
作者:E Roh
DOI:10.1016/s0968-0896(02)00218-3
日期:2002.10
A series of 3'-N-acyl-paclitaxel analogues la-v were synthesized and their cytotoxicities in vitro against several human tumor cell lines examined. It has been shown that distinct correlation between activity and N-acyl-substituent. The appropriate size of N-acyl group was indispensable for cytotoxicity, and moreover, the presence of beta-substituted conjugated double and triple bond to N-carbonyl generally resulted in increase of cytotoxicities. (C) 2002 Elsevier Science Ltd. All rights reserved.
LYUBINSKAYA O. V.; SMIT V. A.; KUCHEROV V. F.; SHCHEGOLEV A. A.; KEHPL R., IZV. AN CCCP. CEP. XIM., 1979, NO 8, 1776-1779
作者:LYUBINSKAYA O. V.、 SMIT V. A.、 KUCHEROV V. F.、 SHCHEGOLEV A. A.、 KEHPL R.
DOI:——
日期:——
Metal-Free Oxyaminations of Alkenes Using Hydroxamic Acids
作者:Valerie A. Schmidt、Erik J. Alexanian
DOI:10.1021/ja204255e
日期:2011.8.3
A radical-mediated approach to metal-freealkene oxyamination is described. This method capitalizes on the unique reactivity of the amidoxyl radical in alkene additions to furnish a general difunctionalization using simple diisopropyl azodicarboxylate (DIAD) as a radical trap. This protocol capitalizes on the intramolecular nature of the process, providing single regioisomers in all cases. Difunctionalizations