title: Formation of Cyclopenta[c]pyridine Derivatives from 2,5-Disubstituted Pyrroles and 1,4-Dibromo-1,3-butadienes via Pyrrole-Ring One-Carbon Expansion.
abstract: Reactions between 1,4-dibromo-1,3-butadienes and 2,5-disubstituted pyrroles afforded cyclopenta[c]pyridine derivatives in high yield, catalyzed by palladium and a cyclopentadiene-phosphine ligand (L1). Insertion of one terminal carbon of the butadienyl skeleton into one C═C double bond in the pyrrole ring resulted in ring expansion, along with a 1,2-shift of an alkyl or an aryl substituent on the butadienes.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.
authors.forename: Jianhao
authors.initials: J
authors.lastname: Yin
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Ye
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Hao
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.
authors.forename: Shuaijing
authors.initials: S
authors.lastname: Du
authors.affiliation: Syngenta Jealott's Hill International Research Centre , Bracknell, Berks RG42 6EY, U.K.
authors.forename: Yucheng
authors.initials: Y
authors.lastname: Gu
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.
authors.forename: Wen-Xiong
authors.initials: WX
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry (SIOC) , Shanghai 200032, China.
authors.forename: Zhenfeng
authors.identifier: 0000-0003-1124-5380
authors.initials: Z
authors.lastname: Xi