Erratum: Copper-catalyzed cascade coupling/cyclization of terminal alkynes with diazoacetates: A straight route for trisubstituted furans (Tetrahedron Letters (2011) 52 (5484-5487))

Full text of DOI:10.1016/j.tetlet.2013.03.055

Tetrahedron Letters 54 (2013) 2558–2558
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Tetrahedron Letters
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Corrigendum
Corrigendum to ‘Copper-catalyzed cascade coupling/cyclization of terminal
alkynes with diazoacetates: a straight route for trisubstituted furans’
[Tetrahedron Lett. 52 (2011) 5484–5487]
⇑
Lei Zhou, Jiachen Ma, Yan Zhang, Jianbo Wang
Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry,
Peking University, Beijing 100871, China
CuI (5 mol%)
phenanthroline (5 mol%)
After reexamining the characterization data of the products
3a–m, we concluded that copper-catalyzed reaction of terminal
alkynes with diazoacetates resulted in the formation of trisubsti-
tuted allenes, instead of the trisubstituted furan derivatives as
reported in the Letter. The structure of compound 3a–m, is now
corrected as below.
R2
N2
R1
+
R2
CO2R3
MeCN, 80 o
C
CO2R3
R1
1
2
3a m
-
2
3
2
3
2a
2c
2e
2b
2d
, R = Me, R = Me;
, R = H, R = Et
2
3
2
, R = Me, R = Bn;
, R = n-C5H11, R3= Et
, R = n-C5H11, R3= Et
2
Me
Me
Me
CO2Me
CO2Me
CO2Me
tBu
(84%)
3c
3a (92%)
Me
CO2Me
3b
Me
(55%)
Me
Me
CO2Me
CO2Me
MeO
3d
(71%)
Me
F3C
3e (86%)
3f (79%)
MeO
Ph
Me
Me
CO2Me
CO2Me
CO2Me
( )3
Me
S
3i (81%)
3h (82%)
3g
(61%)
H
Me
( )4
CO2Bn
(68%)
CO2Et
3j (89%)
CO2Et
3l (95%)
3k
( )4
CO2Bn
(86%)
3m
q DOI of original article: http://dx.doi.org/10.1016/j.tetlet.2011.08.060
⇑
Corresponding author.
E-mail address: wangjb@pku.edu.cn (J. Wang).
0040-4039/$ - see front matter Ó 2011 Elsevier Ltd. All rights reserved.
http://dx.doi.org/10.1016/j.tetlet.2013.03.055