Synlett 2009(20): 3355-3359  
DOI: 10.1055/s-0029-1218373
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Ruthenium-Catalyzed Regioselective Reactions of Nitriles and 1,3-Dicarbonyl Compounds with Terminal Alkynes [¹]

Shun-Ichi Murahashi*a,b, Takeshi Naotaa, Yoshinori Nakanoa
a Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka 560-8531, Japan
b Department of Applied Chemistry, Faculty of Engineering, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
Fax: +81(86)2564292; e-Mail: murahashi@high.ous.ac.jp;
Further Information

Publication History

Received 23 September 2009
Publication Date:
18 November 2009 (online)

Abstract

RuH2(PPh3)4-catalyzed reaction of nitriles with terminal alkynes proceeds highly efficiently under neutral conditions to give the corresponding Michael adducts. Furthermore, 1,3-dicarbonyl compounds react with terminal alkynes at the α-position to afford the exo-methylene compounds with high regioselectivity under neutral conditions. The regioselectivity depends upon the change of substrates. The precise mechanism is presented.

1

Presented at the 40th Symposium on Organometallic Chemistry, 1995, Osaka, Japan.

1

Presented at the 40th Symposium on Organometallic Chemistry, 1995, Osaka, Japan.