Chiral Bicyclic Guanidine-Catalyzed Enantioselective Reactions of Anthrones
作者:Juan Shen、Thanh Truc Nguyen、Yong-Peng Goh、Weiping Ye、Xiao Fu、Junye Xu、Choon-Hong Tan
DOI:10.1021/ja064636n
日期:2006.10.1
catalyst for reactions between anthrones and various dienophiles. The catalyst can tolerate a range of substituents and substitution patterns, making several anthrone derivatives suitable for this reaction. Both Diels-Alder and Michael adducts were obtained in excellent yields, high regioselectivities, and high enantioselectivities. This is the first case of a highly enantioselective base-catalyzed anthrone
手性双环胍 1 被发现是蒽酮和各种亲二烯体之间反应的极好催化剂。该催化剂可以耐受一系列取代基和取代模式,使几种蒽酮衍生物适用于该反应。Diels-Alder 和 Michael 加合物均以优异的产率、高区域选择性和高对映选择性获得。这是高度对映选择性碱催化蒽酮 Diels-Alder 反应的第一个案例。
Lewis Acid Assisted Diels–Alder Reaction with Regio- and Stereoselectivity: <i>Anti</i>-1,4-Adducts with Rigid Scaffolds and Their Application in Explosives Sensing
作者:Qi Chen、Hao Chen、Xiao Meng、Yuguo Ma
DOI:10.1021/acs.orglett.5b02487
日期:2015.10.16
Unusual anti-1,4-adducts of anthracene derivatives and anti-adducts of inert arenes with rigid scaffolds have been obtained via AlCl3-assisted Diels–Alderreaction in good to excellent yields under mild conditions. Further derivation of 1,4-adducts gave π-conjugated polymers which could act as sensors of explosive species. This highly efficient synthesis method provides versatile approaches to solid-state
Involvement of organic fluorine substitution in the crystalline packing structures of tricyclic Diels–Alder adducts derived from diarylfulvenes and N-arylimides
作者:Anke Schwarzer、Petra Bombicz、Edwin Weber
DOI:10.1016/j.jfluchem.2009.11.013
日期:2010.3
Fluorinated tricyclic Diels–Alder adducts derivedfrom corresponding diarylfulvenes and N-arylmaleimides, each of different degree and positions of the fluorine substituents, and including the non-fluorinated parent compound, have been synthesized. Their X-ray crystal structures were determined in order to study the effect of fluorine substitution on the solid state organization in competition with
An efficient electrochemical synthesis of sulfonated phenanthrenes via the reaction of internal alkynes with sulfonyl hydrazides has been established. The protocol does not require a metal catalyst or external oxidants, providing a green and mild route to functionalized phenanthrenes. Moreover, the compatibility of various functional groups and decagram-scale experimental conditions demonstrate the
Polymerization of Diazoacetates Initiated by the Pd(<i>N</i>-arylmaleimide)/NaBPh<sub>4</sub> System: Maleimide Insertion into a Pd–C Bond Preceding to Initiation Leading to Efficient α-Chain-End Functionalization of Poly(alkoxycarbonylmethylene)s
experimental observations revealed the incorporation of one N-arylmaleimide molecule coordinated on the Pd center into the α-chain end of the polymers obtained with the initiating system, indicating that the initiating species of the polymerization was generated by insertion of N-arylmaleimide into a Pd–Ph linkage, which was first formed by the reaction of the Pd(0) complex with NaBPh4, and that the initiating