Stereoselectivity in the Addition of 1,3-Dipolarophiles to 6-Aryl-1,5-diazabicyclo[3.1.0]hexanes
摘要:
Thermolysis of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes in the presence of N-arylmaleimides having a substituent in the ortho position of the aromatic ring leads to predominant formation of the corresponding trans-9-arylperhydropyrazolo[1,2-a]pyrrolo[3,4-c]pyrazole-1,3-diones. 6-Aryl-1,5-diazabicyclo[3.1.0]hexanes react with fumaric acid derivatives in a stereoselective fashion, affording perhydropyrazolo[1,2-a]pyrazoles with a trans,trans configuration.
ready-stock aryl carboxylicacids has been developed based on weak carboxylate-directed ortho-C–H alkylation and concomitant decarboxylation processes, fabricating 3-aryl succinimides, a recurrent scaffold in drug molecules, in high yields (up to 97%). The protocol features operational simplicity, avoids the need for precious metal additives/oxidants, and offers broad substrate scope with formal meta- and
作者:Ping Li、Josef M. Maier、Erik C. Vik、Christopher J. Yehl、Brent E. Dial、Amanda E. Rickher、Mark D. Smith、Perry J. Pellechia、Ken D. Shimizu
DOI:10.1002/anie.201702950
日期:2017.6.12
molecular balances were designed to study and measure fluorine–aromatic (F–π) interactions. Fluorine substituents gave rise to increasingly more stabilizinginteractions with more electron-deficient aromatic surfaces. The attractive F–π interaction is electrostatically driven and is stronger than other halogen–π interactions.
of maleimides, innate electrophiles, has been realized under Ru(II)-catalysis such that exposure to electrophiles delivered products of C–H chalcogenation and amidation in good yields (up to 94%). This protocol features mild conditions and operational simplicity with broad substrate scope, uses an inexpensive and air-stable catalyst, and also represents the first example of Ru(II) catalyzed C–H selenylation
A rhodium(III)‐catalyzedC(sp3)−Halkenylation of 8‐methylquinolines with electron‐deficient maleimides has been accomplished with the combination of copper acetate, 2,2,6,6‐tetramethylpiperidine‐1‐oxyl and oxygen as the oxidant. A variety of maleimides react with various 8‐methylquinolines to furnish the corresponding alkenylated products in moderate to good yields.
Reactions of ketene aminals with n-arylmaleimides and dimethyl acetylenedicarboxylate, a direct pathway to derivatives of pyrrolo[1,2-a]imidazole and imidazo[1,2-a]pyridine
作者:V. D. Orlov、Yu. V. Kharchenko、I. M. Gella、I. V. Omel’chenko、O. V. Shishkin
DOI:10.1007/s10593-012-1123-y
日期:2012.11
N-arylmaleimides or dimethylacetylenedicarboxylate to 2-imidazolideneacetophenones proceeds at the most nucleophilic carbon atom of the acetophenone derivatives and results in a rearrangement to givederivatives of 5-oxo-2,3,5,6-tetrahydro-1H-pyrrolo[1,2-a]imidazole or imidazo[1,2-a]pyridine, respectively. In the case of 2-imidazolidenecyclopentanones and 2-imidazolidine-cyclohexanones, the reaction terminates