Metal-Free Access to Fully Substituted Skipped Diynes. An Efficient Chemodifferentiating A2BB‘ 4CR Manifold
摘要:
A metal-free chemodifferentiating A(2)BB' 4CR manifold for the modular synthesis of tertiary skipped diynes is described. The manifold performs a triethylamine triggered reaction of alkyl propiolates and acid chlorides to assemble two units of each component in the form of two propargylic alkynoates, a tertiary alcohol, and an ester. A differentiated incorporation of the two acid chloride components ensures functional diversity in the final structure. In addition, the presence of two connected propargylic alkynoates provides a reactive platform for complexity generation.
Dominos! The multivalent reactivity profile of tertiaryskippeddiynes has been conveniently exploited in the domino and diversity‐oriented synthesis of fully substituted pyrazoles and 1,4‐diazepane derivatives (see scheme). The developed manifold is chemically efficient and simple to operate. In addition, the resulting N‐containing heterocycles are obtained in a regio‐ and chemoselective manner.
A novel approach to the synthesis of fully substituted pyrimidine derivatives armed with an oxy-functionalized acetate chain at the ring is described. The manifold uses amidines as the nitrogen source and activated skipped diynes as the electrophilic reactive partners in a coupled domino strategy. In the first dominoreaction, two consecutive aza-Michael additions assemble the six-membered ring heterocycle
Privileged scaffolds: Breaking the symmetry of 1,4‐diyne scaffolds by nucleophilic amine addition onto one of two equivalent alkynoate units affords chain‐functionalized tetrasubstitutedpyrroles with five points of functional diversity and two points for complexity generation. The domino reaction manifold entails an aza‐Michael addition, a 5‐endo‐digonal cyclization, and a [3,3]‐sigmatropic rearrangement
Diverting is the game! A new domino manifold has been implemented for the synthesis of cyclohexadienone‐based scaffolds fromtertiaryskippeddiynes and secondary amines. The manifold takes advantage of a new O‐enolate‐driven reactivity pattern discovered for these diynes. The scaffolds are conveniently transformed into the corresponding multivalent salicylate derivatives (see scheme).
Reactivity Control in the Addition of N,N′-Dialkylated 1,n-Diamines to Activated Skipped Diynes: Synthesis of Fused Bicyclic 1,4-Diazepanes and 1,5-Diazocanes
This research was supported by the Spanish Spanish Ministerio de Ciencia e Innovacion (MICINN), the European Regional Development Fund (RDF) (CTQ2008-06806-C02-02), and the Spanish Ministerio de Sanidad y Consumo, Instituto de Salud Carlos III (MSC ISCIII) (RETICS RD06/0020/1046) and the Fundacion Canaria de Investigacion y Salud (FUNCIS) (PI 43/09).
这项研究得到了西班牙西班牙国家科学和创新部长 (MICINN)、欧洲区域发展基金 (RDF) (CTQ2008-06806-C02-02) 和西班牙卫生部长卡洛斯三世 (Instituto de Salud y Consumo) 的支持 ( MSC ISCIII) (RETICS RD06/0020/1046) 和 Fundacion Canaria de Investigacion y Salud (FUNCIS) (PI 43/09)。