C,C-Diacetylenic Phosphaalkenes as Heavy Diethynylethene Analogues
摘要:
A series of C,C-diacetylenic phosphaalkenes 1b-e has been prepared from 1-chloropenta-1,2-dien-4-ynes 6b-e in a reaction with Mes*PCl2 (Mes* = 2,4,6-(Bu-1)(3)Ph) in the presence of LDA. Under identical conditions, isomeric butadiyne-substituted phosphaalkenes 2e-f can be obtained from 3-chloropenta-1,4-diyiies 5c-f. The title compounds represent rare examples of diethynylethenes in which a constituting methylene has been replaced by a phosphorus center. The formation of both isomers can be rationalized by a common pathway that involves isomeric allenyllithium species. Spectroscopic, electrochemical, and theoretical investigations show that the phosphorus heteroatoms are an intrinsic part of the compounds' pi-systems and lead to decreased HOMO-LUMO gaps compared to those in all-carbon-based reference compounds.
[EN] METHODS OF MAKING MULTICYCLIC COMPOUNDS USING MULTICOMPONENT/TANDEM REACTION SEQUENCES<br/>[FR] PROCÉDÉS DE FABRICATION DE COMPOSÉS POLYCYCLIQUES À L'AIDE DE SÉQUENCES DE RÉACTION EN TANDEM/À PLUSIEURS COMPOSANTS
申请人:UNIV NEVADA RENO
公开号:WO2016153906A1
公开(公告)日:2016-09-29
Disclosed herein are embodiments of multicyclic compounds and methods of making such compounds. The disclosed methods reduce step-counts in the synthesis of complex targets, while reducing costs and waste streams.
<i>C</i>,<i>C</i>-Diacetylenic Phosphaalkenes as Heavy Diethynylethene Analogues
作者:Elisabet Öberg、Bernhard Schäfer、Xue-Li Geng、Jenny Pettersson、Qi Hu、Mikael Kritikos、Torben Rasmussen、Sascha Ott
DOI:10.1021/jo901942u
日期:2009.12.18
A series of C,C-diacetylenic phosphaalkenes 1b-e has been prepared from 1-chloropenta-1,2-dien-4-ynes 6b-e in a reaction with Mes*PCl2 (Mes* = 2,4,6-(Bu-1)(3)Ph) in the presence of LDA. Under identical conditions, isomeric butadiyne-substituted phosphaalkenes 2e-f can be obtained from 3-chloropenta-1,4-diyiies 5c-f. The title compounds represent rare examples of diethynylethenes in which a constituting methylene has been replaced by a phosphorus center. The formation of both isomers can be rationalized by a common pathway that involves isomeric allenyllithium species. Spectroscopic, electrochemical, and theoretical investigations show that the phosphorus heteroatoms are an intrinsic part of the compounds' pi-systems and lead to decreased HOMO-LUMO gaps compared to those in all-carbon-based reference compounds.
Cascade Reactions Forming Highly Substituted, Conjugated Phospholes and 1,2-Oxaphospholes
作者:Anna I. Arkhypchuk、Marie-Pierre Santoni、Sascha Ott
DOI:10.1002/anie.201202153
日期:2012.7.27
copy: The reaction of a phospha‐Wittig–Horner reagent with diacetylenic ketones (see scheme) results in a cascade of reactions that can lead to both an oxaphosphole‐terminated cumulene system and an alkene‐bridged bis‐phosphole. The reaction outcome is determined by the nature of the acetylene termini, with phenyl groups stabilizing a carbene intermediate that dimerizes to give the bis‐phosphole product