Latent nucleophiles are compounds that are themselves not nucleophilic but can produce a strong nucleophile when activated. Such nucleophiles can expand the scope of Lewis base catalyzed reactions. As a proof of concept, we report that N‐silyl pyrroles, indoles, and carbazoles serve as latent N‐centered nucleophiles in substitution reactions of allylic fluorides catalyzed by Lewis bases. The reactions
A process for producing an amine which is characterized by reacting an imine with a nucleophilic compound (except a trialkylsilyl vinyl ether) in the presence of a phosphoric acid derivative represented by the formula (1):
wherein A
1
represents a spacer; X
1
and X
2
represent each independently a divalent nonmetal atom or a divalent nonmetal atomic group; and Y
1
is oxygen or sulfur. The invention provides a process by which amines (particularly optically active amines) useful as intermediates of medicines, agricultural chemicals, or the like can be produced without special post-treatment in high yield at high optical purity; and phosphoric acid derivatives (particularly optically active phosphoric acid derivatives) useful in the production of the amines.
Indole- and Pyrrole-BX: Bench-Stable Hypervalent Iodine Reagents for Heterocycle Umpolung
作者:Paola Caramenti、Stefano Nicolai、Jerome Waser
DOI:10.1002/chem.201703723
日期:2017.10.20
Electrophilic Indoles/Pyrroles: The first synthesis of indole- and pyrrole-derived benziodoxole reagents in one step from the heterocycles is reported. The new indole- and pyrrole-BX reagents are stable up to 150 °C and can be used for selective heterocycle transfer onto the C−H bonds of arenes ortho to directing groups by using rhodium or ruthenium catalysts.
Bench-Stable Electrophilic Indole and Pyrrole Reagents: Serendipitous Discovery and Use in C-H Functionalization
作者:Paola Caramenti、Jerome Waser
DOI:10.1002/hlca.201700221
日期:2017.12
reagents allowing the reversal of the standard reactivity (Umpolung) of small building blocks is an important field of research in chemistry, as it allows increasing the flexibility of organic synthesis. Indoles and pyrroles are ubiquitous heterocycles in natural products and drugs. They are usually functionalized making use of their high nucleophilicity. In contrast, only few methods are based on the
作者:Alex L. Bagdasarian、Stasik Popov、Benjamin Wigman、Wenjing Wei、Woojin Lee、Hosea M. Nelson
DOI:10.1021/acs.orglett.0c01745
日期:2020.10.16
l urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalystmediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen-bonding motifs and strong bases affords highly active Lewisacidcatalysts capable of ionizing