Synthesis of C-15 Vindoline Analogues by Palladium-Catalyzed Cross-Coupling Reactions
摘要:
Described are general protocols for the rapid construction of various C-15-substituted analogues of vindoline using palladium-catalyzed cross-coupling reactions. The required bromo- and iodovindolines were prepared in high yield by the reaction of vindoline with N-bromosuccinimide or N-iodosuccinimide, respectively. The study not only led to the preparation of a number of structurally novel vindoline analogues but also opens the door to new strategies for the synthesis of vinblastine, vincristine, and related anticancer agents. Also described is the conversion of ent-tabersonine to ent-vindoline.
CuI / 4-羟基-1-脯氨酸催化的芳基溴化物与N- Boc肼的偶合反应在DMSO中于80°C进行,得到N-芳基酰肼。当使用芳基碘化物时,该反应在50℃下完成并且不需要配体。在CuI / 4-羟基-1-脯氨酸的催化下,氨水与芳基溴化物的偶联反应在50℃下顺利进行,得到伯芳基胺。在这种情况下,发现K 2 CO 3是比Cs 2 CO 3更好的碱。这些过程允许组装N带有多种官能团的-芳基酰肼和伯芳基胺包括羟基,胺基,三氟甲基,酯基,硝基和酮。
Expedient synthesis of indoles from N-Boc arylhydrazines
作者:Young-Kwan Lim、Cheon-Gyu Cho
DOI:10.1016/j.tetlet.2004.01.011
日期:2004.2
The readily available N-Boc arylhydrazines undergo efficient Fischer cyclizations to provide the indoles in good yields, when reacted with enolizable ketones.
Fused Heterocyclic Compounds and Their Use as Mineralocorticoid Receptor Ligands
申请人:Fukumoto Shoji
公开号:US20090253687A1
公开(公告)日:2009-10-08
The present invention relates to wherein each symbol is as defined in the specification. The compound has a superior mineral corticoidreceptorantagonistic action and is useful as an agent for the prophylaxis or treatment of hypertension, cardiac failure and the like, a compound having a fused heterocycle, or a prodrug thereof, or a salt thereof; and an agent for the prophylaxis or treatment of hypertension, cardiac failure and the like.
Enantioselective Synthesis of N–N Amide–Pyrrole Atropisomers via Paal–Knorr Reaction
作者:Yuanlin Wei、Fan Sun、Guofeng Li、ShiYu Xu、Ming Zhang、Liang Hong
DOI:10.1021/acs.orglett.3c03280
日期:2024.3.29
we present a highly efficient enantioselective synthesis of monoheteroaryl N–N atropisomers via an asymmetric Paal–Knorr reaction, affording a diverse array of N–N amide–pyrrole atropisomers with excellent enantioselectivities. Gram-scale synthesis and post-transformations of the product demonstrated the synthesis utility of this method. Racemization experiments confirmed the configurational stability
作者:Moritz Fink、Jannik Stäuble、Maïté Weisgerber、Erick M. Carreira
DOI:10.1021/jacs.4c01786
日期:2024.4.10
convenient syntheses of aryl azocyclopropeniums and a study of their photochemical properties. Incorporation of the smallest arene leads to pronounced redshift of the π–π* absorbance band, compared to azobenzenes. Photoisomerization under purple or green light irradiation affords Z- or E-isomers in ratios up to 94% Z or 90% E, and the switches proved stable over multiple irradiation cycles. Thermal half-lives
Synthesis of <i>N</i>-Aryl Hydrazides by Copper-Catalyzed Coupling of Hydrazides with Aryl Iodides
作者:Martina Wolter、Artis Klapars、Stephen L. Buchwald
DOI:10.1021/ol0168216
日期:2001.11.1
[GRAPHICS]A convenient method for intermolecular N-arylation of hydrazides with substituted aryl iodides in the presence of a copper catalyst and Cs(2)CO(3) is reported. The C-N coupling of N-Boc hydrazine with para- and meta-substituted aryl iodides afforded the N-arylated products A, regioselectively. A reversal in regioselectivity is observed for the arylation of benzoic hydrazide with ortho-substituted aryl iodides, providing the N'-arylated products B.